I'm actually pretty damn impressed by the Tribute line of G&Ls.
I've played both the US and Tribute L2000s and SB2s, and the difference is preeeeeeetty slim.
You get a heck of a lot of bang for your buck with the "budget" G&L.
On the other hand, i've never really played a RockBass that has impressed me. Granted, all have been used, so maybe they were abused... but literally, every one has been lackluster.
Indie-pop, 'till I drop!