I've been using Windows 7 (Release Candidate) for a couple weeks now, and not a single problem to report. It certainly seems faster than Vista while using fewer system resources. So basically it's just an optimized version of Vista, with better driver support and a few tweaks. One of the tweaks: the new combined quick launch and taskbar is quite useful. And the ability to cycle desktop pictures is nice too. I hear they're going to release Windows 7 before Xmas, so either wait for the finished product, or try the Windows 7 RC to see if you like it.