They are so clean that turned all the way up with the overdrive enabled they have almost zero noise.
I have owned Fender, Music Man, Marshall, Pevey (well i'm allowed one mistake), and even have an old Silvertone, but the Rocktron just blew them all away.
I will never get rid of my old Music Man tube head though. I just can't seem to part with it.
Anyway, check out the Rocktron stuff and decide for yourself.
KeepOnRockin'
Th'WOLF