I tested Windows 7 today (only for 30 minutes!). My first impression: I really don't like it! Microsoft changed so many things... I don't like the new taskbar, the new paint, the new explorer.
Maybe the performance is better, but I had no chance to test this.

I guess it will be a flop, like Vista.

I would like to see a XP 2.0 instead of an Vista successor! I won't change to Win7.