Same for me - the keyboard is great, but my "u" key needs quite a lot of force to register (while the haptic feedback ist just as on any other button.

I had some trouble with the connected keyboard losing connection every few seconds, but then I found out it was a self-made problem:
I had a sheet of paper from the "fix-loose-battery-with-strip-of-paper-hack" sticking out from the battery that made the TOH part not sit tight enough on the phone itself.
After fixing that, no more connection issues