Lots of minor features that are missing, but I expect most of that to be taken care soon, if it isn't already in some branches. Right now, there are lots of minor niggles that make me miss my iOS/Android devices of the past (heck, even my old Palm Pre). But the basics do work, you can take calls, multi-task, browse, tweet etc.

Right now what bothers me most is the lack of badges on icons, I'd really like to quickly see how many calls or messages I've missed, without going to the notification pull-down. A 24 hour clock wouldn't hurt either, and the organisation of the Music players is a bit off (no albums under artists, pretty but useless main view etc.). In my release you can't control it from the lock screen, either, but I think that's going to be in the next version, judging from the wireframes.

I'm using it as an everyday device. It's not perfect, but it's usable, especially when considering the low price point.