I haven't tried Win7 but I have it on order and on it's way to me. Time to move up from XP. I hate Vista, it is garbage, much like WinME. It seems like the "proper" way to keep with Windows is run the good version (98/XP/7), then skip a version (ME, Vista), etc.
With Microsoft's O/S track record, I would recommend you don't upgrade to Windows 8 or whatever the next version will be called ;-)
So within the next week or so I'll have my main machine (Mac OSX), my Ubuntu linux (playing around) machine, my new Win7 home theater PC, and then the laptop with (ugh) Vista. I'm thinking of putting Linux on the laptop instead just to make it more stable and run faster.