i'm already been using it since the Beta and RC, i pretty much happy with it's stability.. But i love Vista with SP2 also..
RTM of Windows 7 is way too good now.. I have TECH-NET Account. which i bought when there was an offer in may 2009, for 249$, 1 Year and 3 months.
Windows 7 ultimate is cool.
i'm currently using Windows 7 Enterprise, but i'm getting stability problems with some applications. Windows Live and Skype causing IE to crash with FAULTY ACCESS EXCEPTION.
might be a rare case of windows live and skype, not the fault of windows 7, because windows 7 ultimate was working fine.
i'm disabling those add-on's in IE and going to give it a try and see.
I'm using 64-bits only, since i have 8GB ram, i thought of getting full utilization of it.