When it was rumoured that build 10A432 of Snow Leopard was indeed the golden master, I got very excited. Even though there were copies of 10A432 floating around, I resisted temptation and didn't install.
The primary reason was the potential transition from 10A432 to whatever the final build was; there was no guarantee that I would be able to upgrade. I would more than likely have to revert to 10.5.8, and then upgrade to the retail edition. Reluctantly, I waited until it hit retail, and I proceeded to install it onto my Macbook Pro; lo and behold, it was indeed build 10A432. Oh well, nothing lost except some geek cred. I did this on the 3rd of September 2009.
The upgrade was flawless; mostly everything worked, and the few things that didn't were resolved by the 10th of September. There are a few visible changes, but nothing earthshattering. The big improvement for me is in responsiveness (I haven't seen the beach ball) in ages), and the general overall snapiness.
A worthy upgrade indeed!