So far my initial impressions of the Windows 8 RP is that it's pretty slick. A good integration between the desktop and the new metro interface. Of course there's the issue of the missing start menu, but everyone is pissed about that. I'll see how much, if any, of the old functionality of the start menu I can set into metro to make it palatable. Aside from that little caveat I'm really liking it so far, at least in a testing environment.
The real test is this weekend when I actually do...you know... normal person stuff on it.