I tried Vista x64 when it came out for a good 9 months. I HATED it. Problem after problem. Driver issues. You name it. I swore I'd never try it again, and went back to XP32. Well, I started having problems in XP32, realizing my system was "slow" and wasn't performing as well as it should even though I had the "latest drivers". Well, I burned my MSDN ISO of Vista Ultimate x64 with SP1, and installed... ... ... I can't believe it. It boots up a good 4x faster than XP did, the speed issues I had in XP are gone, and I can do everything I want; play games, run visual studio, you name it. Looks like MS has done a lot to fix vista; and it's nice to finally have an OS that has updated drivers that actually run "quickly". Anyway... So far I'm pretty happy with Vista x64. It definitely runs faster than XP32 - no question... I'm pleasantly surprised to say the least!