I had a Hot Watt II in the 80's that I hot rodded a 50 watt JMP in the 80's sometimes and I have one now.
Theyre loud and kinda cool but I would never play with one now.
My Roomate/bandmember had a Rockman when they came out in 1982' or so, they cost almost $400 bucks which was a lot of scratch considering I bought my first Marshall JMP 2204 for $375.
That lead guitarist in Boston the tall skinny one played with Sammy Hagar in the late 70's & 80's he's Awesome.
Bostons lead singer was singing sharp that whole song above.
Brad Delp committed suicide a few years ago by lighting charcoal grills in his bathroom with no ventilation.
What a weird way to go.