Have tested it for 2 weeks now, but the only thing really bothering me is not being able to get the Classic Start Menu.
The 200 MB partition for booting is something I've been crying for since Windows 2000, this really is sooooo good. to elaborate about that a little bit, install XP on a 120GB Partition, at one point Windows won't boot anymore cos it can't find the ntldr anymore. Even defrag won't help you out then. While off course it is bad practive to have such big partitions for Windows, it is something that happens a lot when Vendors such as Asus and HP have preinstalled the system.

All in all Windows 7 is technically much better, I just hate the GUI for the reasons Allen pointed out and not being able to get the Classic Start Menu back.