I finally upgraded my Mac Pro to Snow Leopard. I give it a “thumbs up” because it was a smooth, trouble free process. It took about an hour, and required almost no input from me. [UPDATED 6/29, 6/30]
Aside from a stability improvement, I saw no immediate, significant changes either good or bad. That was great. Most things worked, including VMWare. I didn’t lose any functionality, either through omission, or through “GUI improvements” that emphasize more common activities at the expense of less common, but still critical, activities.
My biggest gripe is that the Apple “Pro” applications like Aperture were broken by the upgrade. I didn’t find this immediately, since I don’t use Aperture every day. But as soon as I ran Software Update, it fixed the problem. A lame arrangement, IMHO, but at least I didn’t have to go searching for the fix.