We had trouble getting Windows 7 running due to a problem with the display driver, and even now it is running slow. We are working on it with Vmware. We felt like it was important to get it out. So slow is better than nothing at all.
The longer story is... we use Vmware ESXI to power our site and the display driver + Windows 7 does not make for a happy combination.
Some of the links we used to work through our problems were