These are great amps, truly some of Mesa's sleepers in my humble opinion.
The preamp is from the Subway series, the Dyna-watt power section is lifted almost exactly from the DC-3. These are real screamers, and they also have excellent cleans. The high gain solo tone is absolutely stunning to my ears. A/B one of these against popular high gain heads for a real eye-opening experience. Quite powerful - they're louder than many 50 watt heads, I promise you, and they retain a good tight bottom end even when cranked to insane levels. I used to have a Rocket 44 1x12 combo, and now I have a Rocket 44 head and love it. The 44 and 440 are almost identical - the 44 has no presence control, and the 440 has. I'd definitely like to get my hands on a 440 4x10 combo. The only thing about these amps that I find less than stellar is the reverb. It's not exactly bad, just too vague and weak. I use mine for recording and all time-based effects come after the cab mics anyway, so to me it is not an issue. Overall, a unique sound from a unique design.
Shredders would love this amp....but don't tell everyone. I like the fact that few know oor care about these little monsters. :twisted: 8)