Just got mine, first boot went fine thanks to instructions.
It’s possible to live without fingerprint scanner if smartphone is unlocked all the time, while you manually lock the phone when needed (it can be quickly locked with double pressing lock button). However, it’s much harder to live without tap to wake from original Jolla phone.
By the way, C2 initially was very laggy on 5.0.0.21, standard apps did not open and rotation didn’t work. However, after I left it for some time it seems to completed processing something, so now all apps are opening, UI is rotating as it should and performance is more or less normal. Still, hope for better performance in future releases (as already discussed here)