I've been using it off and on all afternoon (well, it's been on all afternoon, but I haven't paid too much attention to the computer).

Overall, I like it, my only complaints have been echoed here already:

1) Can't maximize very effectively.
2) The visualizations are horribly painful on decent slightly old 1 gig machine. And not only oes it look horrible, but it slows everything else down.
3) Later tonight I'll try it on a few newer 2.6 and 1.8 Dell machines and see how it does.