Personally, 7 is an enormous improvement over Vista. Like I said, I see many disparate installations of Vista (dozens every month), and have only found it pleasant to use on a few occasions.

I'm a big fan of the taskbar, and love the pinning behavior, as I was also a big fan of the quicklaunch toolbar. I even like the changes they've made to the system tray behavior. There are a couple "features" that I find useless, like most of the Aero mouse gestures, but that's just because I'm not a big mouse user.

Anyway, I'm looking forward to getting my copies of 7. I'm not certain when they're supposed to get to me, though. I think I preordered from Best Buy, but I don't know whether they're shipping on release day or if they shipped a little early.