I love the fact that it incorporates a spreadsheet element and "cards" and seamlessly pulls from one to the other. Super easy to wrap my head around that system.
We started using this to track project progress within our team, and love the features. Very easy to use and great interface.
The verification engine is very well thought out and works like a charm. Slack integration is great as that is where most users first start when they have a question.
Fearing I would lose all the boards, I didn't do this and assumed that the plan would be automatically degraded.
With a large number of subtasks, it becomes difficult for me to perform actions, because the application has too limited a number of tools for structuring.
It takes too much time to load, and the drag and drop functionality is very buggy.