I switched completely - Jury is still out, but things are working pretty well right now, so it's looking good. I bought a new laptop, and it only came with vista, and although it looks slick, it's slow and Micro$oft has become increasingly annoying, so I decided to give Ubuntu a try.
I only have one application to get going, and I'll be set. I run Ubuntu Studio, and it's working well so far, after the initial bumps. I'm hoping I can stick with this system - I like the advantages it has, and also offers some uniqueness, too.