What's funny with me is that now that I'm used to the Mac User eXperience, including their hardware, I can't even use Windows 7 on an actual PC without major frustration.
Using it on my MAC, though, the lovely trackpad makes it a lot easier! Even kinda nice, ha! Thus, I'm sort of locked out of buying an actual PC to run Windows. No $ savings or extreme graphics card for me, unfortunately, until the PC world leans how to make simple stuff like workable trackpads!
All that said, Windows 7 has certainly sped up.
What's kind of gross, is that MS is still kinda tasteless in the looks department. The little icons always on the bottom, for instance, are absolutely hideous. What are they thinking when they release mainstream software where major UI components were drawn by a random accountant, or taken from a clipart disc made in 1981.
For something that 100 million users see constantly, every single day of their lives, you figure MS could've hired Iconfactory or some other skilled shop to actually make beautiful, congruent buttons for the thing. The way MS leaves their products with an unfinished amateur look really baffles me, when it would only take maybe $10k to $20k of work to take the entire OS to the next level of consistency of interface.
If shareware authors can invest in making make elegant user interfaces, so can MS for the love of god.
Regardless of the that issue, at least there's no real performance issues like there was with Vista. Windows 7 is pretty snappy on my macbooks and Mac Pro. Not so much, ironically, on the beefy (on paper) Sony FW notebook that MS themselves were advertising on TV heavily in 2009! (and, of course, the trackpad and keyboard are crap on it, and the notebook literally began falling to pieces within about a week -- starting at the power junction... whilst my macbooks, even my old 15" with the real keyboard, look just about like new!)
Again, it's Windows 7 on Mac hardware for me. Strange, and not the way I'd like it, but true!