Cap: Now you're getting warm. I own an M10A. Depending on your point of view, it's either the oddest or coolest amp ever. Tonally, a little hard to pin down. Sort of a hot 18-watter (w/7189A tubes, a heavier-duty, higher voltage EL-84 variant) with extras. Mine is in perfect condition, still has the original mullard pre-amp tubes. Came stock with a Jensen C12PS, with "whizzer" cone. I swapped in a more efficient speaker to up the volume, but miss the unique swamp tones from that sweet jensen. Check the harmony central reviews on this. One of them is mine (probably under "Michael D.")
The M10A was my first pick from the suitcase line. Not unmanageable in size and weight, 20 watts or so and some very interesting tone-shaping features. Plenty of volume, a great amp for jams and such, as long as they're not of the cranked twin reverb type. Excellent reverb, plus the always-amazing vibrato. This vibe is somewhat chorusy, more so than other maggies. It can do quiet, clean and sweet, roars and sounds like it'll explode when you crank it. Mine cost more than that. This could be a great deal.