...compared to Vista!
I've been using Vista for 6 months now, but I recently installed XP on a testing computer when I didn't have my Vista disks to hand. I'm now sold on XP, it just feels so much more comfortable and productive compared to Vista. So, back to XP I go...
P.S - as you may know, OSX Leopard is where I spend most of my time, but I still use Windows for .NET dev!