Works just fine, every game I've tried has worked with no issues. If you happen to use any programs that say...cough...write to the registry, you'd want to make sure to set them to run as administrator. Even with UAC set to the minimum level it still wouldn't allow that. Steam runs fine, Skyrim runs fine, XI, XIV ditto. The rumor is that the upgrade after the discount pricing window is over will be $200, so even if you don't end up upgrading right away it would be smart to buy it now. Also, if you upgrade using the online tool, don't spring for the $15 extra CD, the installer process lets you write the files to a disk or USB drive so it really is a waste of $15 to have them ship you one.
Edit to add the $40 upgrade is the Pro version as well, so your $40 would be very well spent. Hardest part to get used to is the new UI, but if you take the time to learn the keyboard shortcuts it's rather intuitive once you get used to it.
Edited, Nov 5th 2012 1:12pm by Wint