RVM is one of those tools that you add to your arsenal that makes you go back and think how you ever got by without it before. This is particularly true if you are working on multiple projects, all of which have their own Ruby versioning/gem set requirements. It's incredible how trivial management has become when I'm dealing with 1.8.7, 1.9.2 and JRuby 1.5.2 (concurrently) on an almost daily basis.