I just upgraded one of my Ubuntu Feisty to Gutsy using the upgrade option via the net, I am assuming this is using Debian's dist upgrade... and wow and did upgrade smoothly. I know Debian dist upgrade works, I have used it once or twice but Ubuntu really puts some good UI and polish to it. I have also removed Automatix, as the only thing that I used outside universe and extra is skype and codecs.
I have also tried to turn on compiz, and its nice... not as distracting as Vista effects. All in all I think Ubuntu is really a good choice... oh yeah I like Ubuntu taking care of installing bluez and ati binary drivers.