u checked out the V3 demo on the site?
V3 looks like a beast, although it looks funny
Yea i know a guy who played on the legacy, he told me the distorsion was (this is hard to describe) a bit sorta gainy (I think he meant a good gain kinda gets crunchier the more gain u throw on) and he went for a model below it.
Ive also heard Carvin have a few issues, and have been known to break down often.
Best thing you can do is play on both, If ur in AUS i think a shop in victoria has em :P