Installed the Beta on my 770 the other night – rather cool I have to say. A few small niggling things, but it is BETA.
Things feel snappier, the thumb keyboard thing is actually pretty good, the handwriting recognition seems faster, perhaps a bit more accurrate (but still nowhere near even the Newton MessagePad 120 – with version 2 of the OS of course).
I still need to get the screen fixed on mine though, as soon as you get much black (or blue) you get ugly stripes and it becomes unreadable.
Can’t wait to get GPE PIM stuff working. Oh, and actual syncing with Evolution.