I downloaded and played with Windows 7 yesterday morning. Got a key too.
You know something, not that bad. Little bit of adjusting to do, and I couldn't find any setting to allow a classical start menu interface. But overall, it's ok.
The install and setup took a while to do, but it was very simple. Booting up is faster, and aside from my sound card, all my hardware was identified and configured. And this is from a fresh install, no upgrade.
Also the WMP 12 beta seems to still have some issues to work out. I couldn't bring up the enhancements pane for audio and video adjustments in media player.
But I haven't tried testing out SFC and Bridge Commander on it, and also some older programs I still use as well. For me, that's important.