Vista went RTM in Nov 2006. If Windows 7 makes Nov 2009 it will have been 3 years. Its not even at RC yet.
I have had Vista 64bit installed since June 2008. It is slower than XP for sure, and I actually dual installed XP to run my Wintel based games. I have found it very reliable but for 1 driver issue it has never crashed.
The biggest issue 4 me with Vista is when it starts up once the os desktop appears you cant really do anything until it has settled. Which can take a good minute or so after the desktop has appeared. On the same PC Win XP is up and ready in 30 secs. (Much more Amiga like OS boot times)
If Windows 7 has XP speed and Vista nuances its got my vote. I remember seeing a quote somewhere at the end of last year that the only good thing about Vista is that it will have a reduced upgrade cost to windows 7.
Don't know if I agree but roll on the RCs and Retail.
:-D