I've been running through a pile of reviews and many people say that the reverb is not nearly as good as the new twin reverb '65 reissue since it has reverb on both channels instead of one (they say that it gives it hiss and reduced reverb quality). Many also say that it distorts too soon or sounds too trebly.
Ive played it at GC at not too loud volumes, so i wouldnt know about the breakup, i liked it alot though, i like the tremelo and reverb just fine, and liked the responsiveness. and i found it nowhere near as trebly as a SR.