That amp is capable of many sounds and there are a lot of amps that sound a lot more like a Marshall than it does. Because of all the radically different design and the variac, it has some really good sounds but it is also capable of some very bad sounds if set up wrong.
I love the playing of Blues Saraceno, but that amp just has the appearance of a constant repair bill to me. Who's gonna work on that thing if it goes down? (I had a jumbo Variac Voltage Regulator once, don't want no more of 'em...)