I've found the keyboard key action on my later order Gemini (47xx) to be perfect
Having done some more typing on my second-batch Gemini, I can say that it's keyboard is clearly not as good as the Psion's. The keys are noisier (and I mean the physical clicky sound, as I've turned off the haptic/vibration and software sounds), they're more likely to stick if you don't press them near the centre, and they're relatively insensitive (many presses don't register).
And the spacebar is particularly bad. Not in the obvious way, though; it works at most points along its length, but you have to hit it pretty close to the middle of its
width. If I hit it just a few mm too far up or down, it sticks and won't press. (On my 5mx, you can the spacebar anywhere along any edge or corner. On the Gemini, anywhere near the Voice Assistant label sticks solid.)
It's not bad, and better than some keyboards I've used, but there's still clear room for improvement.
And on the software side, far too many apps don't recognise PgUp/PgDn/Home/End; and there's no way to type characters such as curly quotes and long dashes (and anything else not listed in the Sym or emoji pop-ups).
Plus (as discussed elsewhere) it could do with key shortcuts in the AppBar or elsewhere.