Thinkingphones - most complete UCaaS solution out there
Value for Money
I have been searching for many years for the ideal cloud-based Unified Communications solution for the enterprise. When I came across Thinkingphones recently I was so impressed I immediately signed up as a reseller. Not only does it have all the features (including call-centre functionality), linking to CRM, social media integration, full HD video, analytics etc. it also has a very professionally run infrastructure for provisioning. This company has spent a lot of time getting this product ready for the enterprise - both large and small.
Complete package, professional, costs savings, good support and professional services
None that I have found yet. You do need a good network, however - but this is the case with every UC solution.