I have been using Vista (32 and 64) on all of my machines (3 desktops, a 9300, 1710, and now a 1730) since Vista launched. It's been a somewhat bumpy ride, but not that bad compared to what I have been reading online. I have gotten quite used to it and I like it.
However, this thread inspired me to install XP Pro SP3 (slipstreamed) on my 1730. The reason I did this was I was getting craptacular SLI performance with Vista 64 and some of the L2VG drivers. The framerates were okay, but whenever I launched a game the screen would flash to black about 6 or 7 times before settling in the game. Just too unstable for me. I tried a few different drivers and they were all the same. I wonder if this is why Dell has yet to put out official 64 bit drivers (at least not as of about 2 weeks ago), but I digress....
XP Pro SP3 absolutely has my 1730 purring. The benches were average (I think I pulled 11,400 in 3DMark06). But now when I start a game, it just starts. No more annoying flashes to black. I'm using the Dell Performance Driver.
Since there is also a Dell Performance Driver for Vista 32, I am going to try that again with SP1 slipstreamed. I am hoping it performs as well as XP because I really want to stay with Vista. I'll probably do that tonight. Will send an update.
It's really a shame about Vista 64. I had all of the issues worked out except that one, and I just didn't feel like installing 150 different video drivers. And I really wanted to use my full 4GB of RAM