Overall my experience till now is okay.

The best that I like about this is that it is integrated with Jira, so you can easily get various data from different teams working on that project. Also during iteration planning, it helps a lot to develop the stories and track the backlogs. It is a very useful tool.

The software is a bit slow and laggy, basically, it takes some to load and render the data.

This plugin makes Jira the best agile portfolio management tool out there. Grouping projects in the gantt chart is very easy and straightforward. In the gantt view so many features as are available that you can basically use that screen alone to do over 80% of the PM work. When I use it I feel like I am saving a lot of time.

Hard to find downsides, but it can be very slow at times. It lacks some AI predictive analysis functions to help Project Managers speed up their work. Also, once you go over the free licensing seats you pay for all seats including those that were free. Not a great incentive to grow teams.