Installed it at work this morning and I've been messing around with it since.
Got the usual around half of the apps auto restoring, which seems to be a google issue and isn't a big deal. Got everything set up and it's running very smoothly. Haven't had any deal breakers yet (even with the lack of GPS and camera functions).
I think the only bug I've come across is in the stock messaging app. I switched over to the black background and everything looked fine until I selected the "back to all threads" option. After that it seemed like half of the time it tried to load both the whit background and black background font settings, so half were readable and half weren't while in the all threads screen.
Everything was fine in the individual threads, but any time I selected a thread and backed out, it would change which threads had light fonts and dark fonts. It all went away and worked fine after unchecking that option though.
So nothing big, just an odd little quirk so far.