I'm actually voting opposed to Randy's notion.
I usually keep the previous version on the computer as a safety net.
But I do install the new version as soon as I get the box, and a spare minute to install it.
I want to see how some new features effect certain processes, see if there's any trouble using any customizations with the new release, to take care of that before the proverbial turd hits the fan, and well... to play :-p
Plus, I'm the CAD go to guy here... I want to be able to advise and answer to any situation that comes up. I don't want to settle for reading the release notes... aside from not having the attention span for it.