- there seems to be no way to dim it and it's way too bright in the dark.
- the context specific functions appearing and disappearing make it really eye catching and distracting. There also seems to be a slight lag before it updates with the latest context. (I ended up switching it to only show some small subset of default controls).
- I'm hardly using it at all, but sometimes it just stops responding. Hitting the buttons doesn't do anything.
- it's too easy to accidentally tap one of the buttons.
All in all I think it's a gimmick and I'd much rather have a physical escape key.