In the old days, when I was writing how-to articles and books on computers, I often had beta editions of a new operating system running on one of my computers, and would upgrade to the gold edition on the first day possible. Plus, back then I almost always had a "test machine" that could get screwed up.
Nowadays, I'm not so much a pioneer (which is a good thing, since pioneers are often the ones with arrows in their backs.) I let the initial adapters jump in, and find all the incompatibilities and bugs that were missed during the testing phase. So before I upgrade to OS X Lion, I'm going to be checking all the compatibility reports on apps that I use all the time.