As I'm getting used to the new phone and mainly the keyboard, I've done some typing tests. At the moment, I am getting 300-320 (340 peak) characters/minute (German, including capital letters). This is good news since on my Pro1 I was at 320-330cpm with 370 peak (only English) and I'm only using the keyboard for around two weeks now.
Especially the reprogrammed keys Ctrl right / Right shift help a lot.
Currently, I'm already typing blindly quite often but I have to 'recalibrate' my position after deleting characters.
The keyboard definitely has potential!