I've been running Win 7 RTM x64 for a few months now and hell yes, it's much MUCH better than the gutter tripe that is Vista. All my programs and a shitload of games run splendidly and I have yet to have any major issues with compatiblity (just a few minor problems that have been resolved). I like it, can't really complain much about the 64 bit system OTHER THAN the fact that you will have issues with Quicktime if you're running the 64 bit version. Fucking lazy bastards at quicktime refuse to author a proper 64 bit Quicktime version that supports VR Panorama and VR Object manipulation which pisses me off a bit as I tend to use those a lot for renderings I make.
Other than the lameness that is Quicktime (and i'm not attempting to blame M$ for it BTW) I say Windows 7 is the shit!
Other than the lameness that is Quicktime (and i'm not attempting to blame M$ for it BTW) I say Windows 7 is the shit!