I want it. Seriously.
Nothing cooler then a Black Faced Maverick. Sexy! I have seen this listed before maybe a year or two ago. Same prototype number. I remember it well. I would say that if you want a Mav, it's cool but I wouldn't pay more then the normal rate for Mavericks for this just because it's a prototype. Mavs are not at all collectible or rare. They are fantastic amps, and I think the starting price is fair for it.
The clean is up there with the best Boogies to me. The dirty is almost unusable (to me and my playing) Way flubby and muddy. I think if I had a Strat, it would be a different story, but my guitars sounded bad with the dirty. I got the best sounds out of channel two when I used it as an alternate clean sound (like a Lonestar kinda) and ran pedals in front for medium gain sounds. The reverb on a Mav is also spectacular.