Yes, I am one of those guys who ordered Snow Leopard to arrive at my door step this morning. (It was free shipping by the way.) I think it is well worth the upgrade money. The upgrade actually gave an extra 10 Gbytes of free space.

Snow Leopard officially launched today. Seamless upgrade; it simply "works".

After installing Snow Leopard, I found that Quicksilver that I installed in the past did not function properly (the Preference would not load). This problem was solved by deleting the folder “~/Library/Application Support/Quicksilver” and installing version B56a7.

Update:

• The Services Menu Module crashes with Snow Leopard. So don’t install that.
• The trigger “Select (null) in command window” will not work in Snow Leopard. But one can always use Command+G (⌘+G) for that purpose after opening the Quicksilver command window.