I just bought an envy x2 and I love it. The battery life on the tablet for me was about 7 hours, and with dock was about 12. The build quality is fantastic though, the tablet is solid and so is the keyboard dock. I would have liked to see more ports on the tablet, but the dock makes up for it (a non-issue for me cause I'll almot always have the dock with me). The keyboard as nice, its full-sized but the keys are a little shallow so not bad, but not the best typing experience. The screen is nice, good viewing angles. I really like the look of it, its the only dockable tablet that actually looks like a laptop, not a tablet that's being docked into a keyboard (I'm looking at you ativ, acer w510, and asus vivotab!!!).
Camera is good and performance is snappy. It lags a tiny amount with stuff like scrolling on the desktop, but otherwise its fine. I haven't really had a chance to test out normal x86 apps yet like office, and vlc, utorrent, putty...etc. I'm returning mine tomorrow and swapping it out cause mine has 3 dead pixels on the screen (so that the guy above doesn't think only hp's have dead pixels, this happens all the time on computers in general. I once sold a guy a Samsung galaxy tab 10.1" the original and he returned 3 of them because of dead/stuck pixels to this stuff happens to all brands unfortunately...). So far though, the more I use it the more I like it. The tablet it light, the keyboard is good, and I've never been a huge proponent to adobe flash, nor do I like the technology, but I have to say that its nice to have a tablet that loads web pages like my desktop does without having to do anything special, you tube comes up like youtube, vimeo, flash games on newgrounds, they all work like they should (cause this is a pc, but its nice on a thin and light tablet, flash is also perfectly smooth and not stutter which I am surprised with!!!).