All H2X Reviews
1-25 of 34 Reviews
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Joyce
Verified reviewer
Mechanical or Industrial Engineering, 11-50 employees
Used daily for less than 6 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed February 2024
Amazing Tool and Customer Service
H2X made my life easier, it's easy to use once you get the hang of it! It made me excited to get on with my drawings as soon as clock in. They also have the Best Customer Service! I 'm guilty for asking a lot of questions, and [sensitive content hidden] responds to me very quickly with answers to help me with the projects I'm working on.
CONSI know it's straightforward enough, but maybe it would be handy to have a handbook or a cheat sheet.
Joe
Construction, 2-10 employees
Used monthly for less than 12 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed August 2021
MEP Deisgn - UK Building Services Consultants
H2X is a fantastic software. I foundH2X very intuitive. It feels like a 21st century software and has an app like appeal, It is very easy and quick to use and takes a lot less time to teach new engineers how to use the software. I have used H2X on several projects . Generally I have used it for sizing domestic water systems and the associated plant items, the speed and simplicity in using the software defiantly makes my life a bit easier. It's a very comprehensive design software which I would recommend anyone to try.
PROSPersonally I found H2X very intuitive. A computer literature engineer could pick up the software in a day with no training. I like the flexibility in design, for example you can change the piping material or velocities across the whole project in a few clicks, alternatively you can manual change individual sections. Being cloud based and not being tied down to a specific desktop is very useful. The ability to output to Revit is a fantastic time saver.
CONSThe way it outputs the notes in the results page is limiting. Ideally you would be able to drag and drops the notes so it's cleaner, as in a busy drawing it can be difficult to read. Sometimes the error warnings may not be pertinent to the project for some reason, but there is not an option to hide or turn these off. However, if you submit the calcs to the client and their is a big yellow safety warning, it makes them nervous. I think it should be possible to turn on/off the warnings.
Reasons for switching to H2X
Initially because H2X is cheaper. So we tried the software out with a free trial, and decided to stick with it and use H2X going forward.
Vendor Response
Hi Joe, Thanks for the detailed review, it's been great working with your team to date. I'm pleased to let you know that we listened to your feedback and in our recent release, we incorporated a warning review section with the ability to turn off warnings if you don't think they are relevant. I will let you know once we have a solution to the positioning on the pdf export. Thanks again!
Replied January 2022
Milly
Civil Engineering, 11-50 employees
Used monthly for less than 12 months
OVERALL RATING:
4
EASE OF USE
3
CUSTOMER SUPPORT
5
FUNCTIONALITY
4
Reviewed November 2020
A software that makes calculation easier
This software provides different calculation methods and can provide all the calculation result that may be rrequired.
CONSSometimes it's a little bit hard to change things. For example, if i want to increase the pipe size to minimise the friction loss, i will need to select all the pipe one by one ( they are separated by the fittings).
Vendor Response
Hi Milly, Thanks very much for your feedback, we really appreciate it! We remember you mentioning this to us and because of the inefficiencies you experienced we have added a 'minimum pipe size' feature that will mean you never need to do this again. You can edit the minimum pipe size in Settings > Flow Systems. Also, using our 'select similar' feature, you can quickly edit the properties for multiple pipes or fixtures all at once. To select similar, firstly left click on the fixture or pipe and then right click and the select similar box should appear, here you can enter properties for fixture groups or pipes. I hope this helps, don't hesitate to reach out if you need anything or have any other ideas for new features.
Replied November 2020
Joshua
Construction, 2-10 employees
Used daily for less than 6 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed February 2024
Brilliant!
so far incredibly postive, customer focussed, easy to communicate with, and invested in my success!
PROSThe H2X Engineering sales team go above and beyond to ensure customer satisfaction. They are flexible, responsive, supportive, and collaborative. Thanks H2X engineering, here to a long standing business relationship!
CONSCant think of anything I dont like or have found that im not happy with.
Reason for choosing H2X
Personal recommendation from a colleague and for the reasons I have stated above.
Reasons for switching to H2X
let down by the software and did not have a positive experience with the sales team.
Dan
Environmental Services, 11-50 employees
Used daily for less than 2 years
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed October 2023
H2ecO Ltd
As a heating installer we use H2X for all of our pipework design and now heat loss calculations aswell from PDF. It save us so much time, not sure how we survived before...!
PROSIts well thought out for installers who don't use CAD but still need to be able to design systems, which is all installers. its alot of drag and drop and not alot of remembering which key does what so its easy to come back to if you haven't used it for a while
CONSas a future ad on, it would be great to have radiator size choices generated from the room output required would maybe require manual input from a manufacturer data sheet though??
Reason for choosing H2X
We were looking at AutoCad training but its a huge commitment but now we dont need to worry about that
Richard
Construction, 11-50 employees
OVERALL RATING:
5
EASE OF USE
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed May 2021
H2X calculates
H2X has proved to be a useful and powerful tool to add to our office. The basic operation of the program is easy to adopt and the learning curve is reasonably linear. Like every program, there are tricks a tips to increase productivity and ease of use. The friendly and helpful staff are more than willing to help you adapt and progress with your operation of H2X.
PROSH2X is an easy program to learn and use. The user interface is designed with an intrinsically logical progression of functions and operations. The calculations can be performed at any point during the design development to capture design errors and the effects of alterations immediately. The ability to select and fix pipe, fitting and fixture details and selections is very useful for design proofing and fault finding in new and existing service designs. Uploading and manipulating .pdf background documents is also easy and hassle free. New levels and relevant information are easy to add into the project. Scaling of .pdf background documents is easily done with a high degree of accuracy. Bearing in mind that a .pdf document is an image file with little intrinsic data relating to line accuracy or drafting limitations, H2X willingly creates usable design models with limited fuss. H2X is capable of calculating pressure systems to many different national and international design standards. The selection of design standard can be changed and recalculated at any point within the design process, the projects can be copied and saves as parallel models thereby allowing for side-by-side comparison calculations as required.
CONSThere are no warnings within the planning tab advising of the potential to move .pdf backgrounds within the H2X model, nor is there an option (that we found) to lock the .pdf back grounds into place. While we understand that H2X is a stand alone calculation program with output drawing frames to showcase H2X, it would be useful to have more flexibility with regard to drawing output framing and title blocks. The output drawings are centered about the H2X model as a standard and do not allow for nonstandard drawings or plot layouts that have additional information that displaces the model information. We understand that this is a web based program that enables H2X to be centrally controlled and located, however this is also an issue for those users with unstable / unreliable internet connectivity. H2X does not offer (within the trial version) an option for local installation, work and save on and of models.
Vendor Response
Thank you for the detailed review Richard. We are glad you enjoyed using H2X and we are looking forward to working with you again on your upcoming projects.
Replied July 2021
Anonymous
11-50 employees
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
4
Reviewed August 2022
A Game Changer for the Humble Plumber
Incredible...... is all I can say. I have implemented a lot of software, some good, a few bad... but this one so far has been a breeze. You ask a question and within minutes (regardless of the time zone) it gets answered. These guys are on POINT. Well done boys
PROSI had been searching for a product/software of this nature for many years. I stumbled across H2X from a consultants design when I seen a tiny reference to H2X website..... Low and behold I found the holly grail of plumbing design by clicking on this link.... I started a trail version, got a wee demonstration from [SENSITIVE CONTENT] who was more than happy to help with any questions I had, in an extremely timely manner. This software is intuitive, super easy to use and has many great features to help any old humble plumber with a simple or even more complex design without the need to engage a mechanical consultant .
CONSI can't find many yet.... Been able to undertake Stormwater Calculation with rainfall intensity would be amazing.... I hear this might be in the pipeline. Exporting designs in PDF's to show all pipe sizes would be ideal as well.... No all sizes and pipe products can be shown on the one document
Reason for choosing H2X
I could not find an alternative product
Rob
Construction, 11-50 employees
Used weekly for less than 12 months
OVERALL RATING:
5
EASE OF USE
4
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
4
Reviewed September 2023
Accurate and Time Saving
H2X is very easy to use and is very simple to make adjustments to once the system is designed. Calculations are quick to complete and make adjustments to throughout the duration of the project. The amount of time H2X has saved us in invaluable.
CONSH2X takes a small amount of time to get to grips with and understand the way information needs to be inputted. However once that is understood it is very easy to use. It also sometimes has a tendency to lag which can be frustrating at times.
Vendor Response
Thank you for taking the time to leave us a review, Rob! It's great to hear that h2x has helped your team improve your design processes and save time. We're always looking to improve and make h2x even easier to learn, so your feedback is appreciated. We're looking forward to continuing to work with you and the rest of the team!
Replied October 2023
Aaron
Civil Engineering, 201-500 employees
Used weekly for less than 12 months
OVERALL RATING:
4
EASE OF USE
5
VALUE FOR MONEY
4
CUSTOMER SUPPORT
5
FUNCTIONALITY
4
Reviewed October 2020
Just about does it all!
H2X has dramatically cut down our design and calculation times and allows us to easily trial different system configurations to help select the most appropriate. It has allows improved our QA and record keeping process.
PROSH2X is very simple to use but generates incredibly accurate and detailed results and selections.
CONSIntegration with other drafting software would be a valuable improvement as this would eliminate "double handling".
Vendor Response
Hi Aaron, Big thanks for leaving us a review, it's great to read your positive comments. You'll be pleased to know that integration with other drafting software is at the top of our development list and as an annual license holder you receive all new features for free. Watch this space, the ability to export your designs from H2X straight into your drafting software is just around the corner!
Replied November 2020
Andrew
Construction, 2-10 employees
Used monthly for less than 12 months
OVERALL RATING:
4
EASE OF USE
3
VALUE FOR MONEY
3
CUSTOMER SUPPORT
5
FUNCTIONALITY
3
Reviewed October 2020
WIP
I personally need to use it more but i think this will be the main hydraulic tool of the industry in the future it is great that i can get a grad/intern to use it and get going relatively quickly, then i can come in and tweak to get the final answers, i don't have to go through the ins and outs of calculations.
PROShot keys are good colors are good Ease of calculation type selection
CONSbugs, we have had issues on a number of times, ie rendering errors. This has impacted on deliverables and meant we had to revert back to the manual process
Vendor Response
Hi Andrew, Thank you very much for leaving us a review, I'm very happy to hear you think H2X will become the main hydraulic tool of the industry, that's certainly what we're aiming for! I wholeheartedly apologise for the occasional bugs you have experienced; they are rare now that our beta phase is over, which you guys were a huge part of, thank you for that! We take any glitches very seriously and believe me no one is more frustrated by them than us. We are striving every day to make H2X the best it can be and our developers do a great job of responding to and fixing any issues as quickly as possible.
Replied November 2020
Callum
Design, 11-50 employees
Used weekly for less than 2 years
OVERALL RATING:
5
EASE OF USE
4
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
3
Reviewed April 2023
Callum - Junior Hydraulic Consultant
H2X is a great software, our company use it nearly every day. The ease of completing a design and passing on to a draftsperson is critical for us to keep advancing with ever growing workloads. Jonny is also extremely helpful and more than happy to help at any time.
PROSThe ease of changing different calculation methods at the click of a button. Easy to use. Direct conversion from H2X to REVIT & CADD.
CONSCan be a bit 'clunky' at times, Unknown errors pop up from time to time. No confirmation of errors in design mode.
Vendor Response
Thanks so much for taking the time to leave us a review, Callum! We're glad to hear that h2x has helped your company keep up with its workload and that you're enjoying the exports. Our software developers are continuing to make improvements to the errors/warnings so that they are easier to understand and so that you know whether they are suggestions or necessary changes. Your feedback is always appreciated!
Replied October 2023
Daniel
Construction, 2-10 employees
Used weekly for less than 6 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed July 2021
BS EN 806 Residential Care Home, England, UK.
I had the pleasure of a free trial for the software after seeing it advertised on LinkedIn and having a positive discussion and interactive training with both [SENSITIVE CONTENT]. I have used the software on two projects, a residential project and a care home, it has been a pleasure to use and I will defiantly not be changing back to previous pieces of software I have used.
PROSThe complete software package was a breath of fresh air compared to alternative hydraulic calculation software's on the market. The usability of the system was effortless compared to it's competitors in the UK. It is a free flowing piece of software which allows the user (on the basis the user have a good knowledge of Public Health Engineering) to design, distribute and calculate domestic water services simply with a few clicks of a button.
CONSThe only piece of the software which confused me slightly was the hot and cold water defaults on the appliances, however I believe this is a regional thing. Once I was aware that I need to allow a hot connection to the outlet (rather than warm), the issue was easily resolved and caused no delays.
Reasons for switching to H2X
H2X was simply much more user friendly and there are no work around requirements when calculating in accordance with BS EN 806.
Vendor Response
Hi Daniel! Thank you for taking the time to leave us a review. It's great to hear that H2X is providing positive benefits to your design process in the UK.
Replied July 2021
Devni
Design, 11-50 employees
Used weekly for less than 6 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed May 2023
Incredible Software!
This software is super user friendly and easy to learn. The visual aspect of it makes learning and understanding plumbing far more interesting. This software allows you to save so much time and enables you to see your design flaws almost instantaneously. The response time for any inquires I've had was astounding regardless of the time difference, and the effort put into explaining and answering all my questions was truly amazing! Job well done :)!
CONSI don't have any negative comments as i know the team is constantly do their best to improve their software. although if it would be possible to do stormwater calculations, that would be awesome but like I said before I'm sure this too is in the works and I can't wait to test it and any other new features that may come along.
Vendor Response
Thank you so much for all of your positive feedback, Devni! We pride ourselves on our customer support, so it's great to hear that you've had an amazing experience. As you mentioned, we are always improving the software... I'm pleased to be able to say that we have since added Stormwater calculations to our growing list of features in h2x. Let us know if you have any other requests!
Replied October 2023
Kane
Construction, 10,000+ employees
Used weekly for less than 6 months
OVERALL RATING:
5
EASE OF USE
4
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed June 2021
H2X Review
Very, very useful tool that is likely to make a real impact in the industry. The dev team are extremely helpful, proactive and knowledgeable - able to provide general hydraulic design advice as well as that pertaining to the software itself. Can see this type of software eventually making its way into the Autodesk suite and becoming as ingrained in the industry as CAD or Revit
PROSThe versatility of providing instant calculations using a variety of methods. This allows us to instantly compute different pipe sizing methodologies and showcase the subsequent cost and time savings that can be achieved by using alternative standards. This can streamline workflows in the order of days depending on the size of the project and has the potential to be a big driver in a revolution in material and engergy usage in plumbing installations in Australia
CONSThe markup/drawing UX is still in development, however this is being continually improved. Minor discrepancies in usability between H2x and more typical modelling/drawing software (AutoCAD/Revit) can hinder markups of larger projects. Just needs some more in-built toold to really bring upo the fluidity of drawing and modelling
Vendor Response
Hi Kane! Thank you for the review. Great to hear you can appreciate the long term vision for H2X's design methodology.
Replied July 2021
Abdul
Civil Engineering, 2-10 employees
Used daily for less than 2 years
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed December 2021
H2X Software
It is quick and easy saving hours of works in complex projects.
PROSIt is easy to use and is very helpful to redesign when the building layout changes. It also takes out the human error when we do the calculations manually.
CONSIt could be great if the features such as roof water design can be included.
Vadym
Construction, 51-200 employees
Used weekly for less than 12 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed November 2020
Good and flexible tool
Good idea, perfect for small jobs.
PROSAbility to tweak a system in real time. Abundance of calculation standards.
CONSDoes not handle big jobs well. I find it very hard to use it for jobs with more than 1000 fixtures Integration functions don't work for big jobs.
Reason for choosing H2X
Price + ability to switch between Australian standard and DIN.
Vendor Response
Hi Vadym, Thanks very much for taking the time to leave a review. I'm glad that H2X is mostly satisfying your needs! I'm surprised to hear that it hasn't worked on a larger project for you, we've generally found H2X comes into its own for the bigger jobs and it's where a lot of our users report the most efficiencies. I have emailed a link to our calendar so you can book in a time that suits you to run through the specifics with us and get any issues resolved ASAP. Thanks again!
Replied November 2020
Blake
Construction, 201-500 employees
Used weekly for less than 6 months
OVERALL RATING:
5
EASE OF USE
4
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
3
Reviewed October 2020
Design confidence and real time design anylising
H2X has helped us streamline some areas of our workflow by consistently allowing us to size and analyse our designs at markup stage accross a broad range of projects. Currently it is being used in residential and commercial projects.
PROSBeing able to size and anayise pipework sizes and test pressures and pump duties required in real time has been very efficient and has also increased confidence in the design.
CONSSetting up the drawings and levels is a little tedius at times, and the height and base of risers would be easier to understand if they were in reference to the levels of the project rather than the over all level. for example, base: 2.3m above floor of basement and top: 2.9m above floor of level 6.
Vendor Response
Hi Blake, Thanks for the review! It's good to see you are experiencing high design efficiencies and have a lot of confidence in the software. I think the option to set the levels of the risers by referencing floor or ceiling numbers is a great idea. I have entered this as a feature request. Please let me know if you think of any others, H2X wouldn't be what it is today without valuable feedback like this.
Replied November 2020
Nathan
Construction, 2-10 employees
Used monthly for less than 6 months
OVERALL RATING:
4
EASE OF USE
5
VALUE FOR MONEY
4
CUSTOMER SUPPORT
5
FUNCTIONALITY
4
Reviewed October 2022
H2X Thankyou!
So far we are very happy, it gives us more confidence with design as well as the ability to review other options easily without having to go into detailed calculations. Im looking forward to developing our skills with the program and using it to its full capacity.
PROSIntegration was very easy. The support is amazing and most importantly ongoing! we are finding it a great way of cross checking and undertaking detailed QA on critical areas of a design. We have definitely only scratched the surface on what this product can do and its only getting better with more and more features.
CONSOnly issues we are having is working out input of data and meanings of the warnings, however we never undertook any real training and most of the issues Jordan answers within hours (most of these are our input errors anyway). To be honest we cant really fault it.
Vendor Response
Thank you, too, Nathan! We are always more than happy to help, and so glad to hear that you are finding h2x to be a great tool for you. Our team is constantly working on making information clearer in terms of warnings and suggestions, and we're expanding our YouTube content to make sure that users know what inputs are required for different systems. As you mentioned, we're always adding new features and improving, so let us know if you have any requests!
Replied October 2023
Nick
Design, 2-10 employees
Used weekly for less than 2 years
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed October 2020
Love this Software
Postive and beneficial.
PROSSimple and easy to use and saves hours on re-design/recalculating when the architect changes the floor plans!
CONSThere isn't much i can say here, well done H2X.
Vendor Response
Hi Nick, Thanks very much for the positive feedback, it's great that you are saving hours on re-design. We appreciate the support!
Replied November 2020
James
Construction, 2-10 employees
Used monthly for less than 12 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed April 2023
Great design platform
Brilliant, simple and easy to use. Game changer.
PROSWe’ve had a great experience with H2X. So easy to use and has saved us hours of time and avoided the use of spreadsheets with no visualisation.
CONSSome features we don’t use, but I would t say that is a negative, they just don’t fit with our process
Vendor Response
Hi James, Thank you so much for the review! It's great to hear that you've had a great experience and that you've saved time on your designing & calculations. We're always adding new features, so I hope that there will be more that fit with your team's process in the near future. Let us know if you have any requests!
Replied October 2023
Larsom
Design, 11-50 employees
Used weekly for less than 12 months
OVERALL RATING:
4
EASE OF USE
5
VALUE FOR MONEY
4
CUSTOMER SUPPORT
4
FUNCTIONALITY
4
Reviewed February 2021
Best software for designing plumbing systems.
H2X is very easy to use. It takes less time to design when compared to conventional method using sketches and excel sheet. I use this software for designing medium and big projects.
CONSEasy to use, accurate results, options to use different plumbing standards
Vendor Response
Thanks for taking the time to leave a review Larson! Glad you can appreciate the benefits over traditional methods
Replied April 2021
Leon
Construction, 11-50 employees
Used weekly for less than 12 months
OVERALL RATING:
4
EASE OF USE
4
VALUE FOR MONEY
4
CUSTOMER SUPPORT
4
FUNCTIONALITY
4
Reviewed October 2020
Hydraulic review
Pleased.
PROSThe ability to review content during the process and alter small items with minimal fuss.
CONSPotentially user cost for SME. we could have the ability to reduce cost for multiple purchases.
Vendor Response
Hi Leon, Thanks for taking the time to leave us a review. I'm glad you are pleased with the software, it's been a pleasure working with you and the team.
Replied November 2020
Josh
Design, 10,000+ employees
Used weekly for less than 12 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed March 2021
Great product
H2X saves time on calculations and markups, allowing you to do both simultaneously.
CONSWhen doing very large projects, if you make a mistake in the design it can be hard to find the fault. Fortunately customer support [SENSITIVE CONTENT HIDDEN] is fantastic at responding to queries and resolving problems.
Vendor Response
Thanks Josh!
Replied April 2021
Stephen Jon
Construction, 11-50 employees
Used weekly for less than 12 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed April 2021
Extremely fast and accurate way of sizing pipes and very enjoyable to use
Great support service, [SENSITIVE CONTENT HIDDEN] can't do enough for you and always seem to be willing to lend a hand
PROSAutomatic cost estimation and bill of quantities is a fantastic and informative inclusion
CONSIt would be great if it automatically sized cold water storage tanks
Vendor Response
Thanks for taking the time to leave a review Stephen!
Replied July 2021
NICHOLAS
Construction, 2-10 employees
Used monthly for less than 12 months
OVERALL RATING:
5
EASE OF USE
5
VALUE FOR MONEY
5
CUSTOMER SUPPORT
5
FUNCTIONALITY
5
Reviewed July 2021
Ilias Design review of H2X
-Quick turn arounds for design -Quality assurance as you can quickly calculate pipe sizing using DTS solutions (As 3500) or utilise alternate codes to size where required. -Ease of use
PROSH2X was easily integrated into our business to fast-trak engineering processes we do within our field of hydraulics. The system is simple and easy to understand, and provides an array of information. Integration with revit software will also reduce drafting lead times, and a bonus as its sized prior to input.
CONSA few bugs throughout the year with some downtime, however the customer service team was ready to help out.
Reason for choosing H2X
H2X was the first product of its type introduced to IDG