As I wanted to benefit from the" faster and buffered key detection" and the "better event management" I took the chance yesterday. Everything went smoothly and pageturns seem to be faster now (I'm not going to test to see if its a placebo-effect or not - I like it :P)
No lockups or other problems.
The battery-calibration is something I can live with, I am trying to keep the battery fully charged at all times, and when there is no chance to recharge it wont change anything really - I'm gonna ready as long as I can
Thanks for all the input to everybody!