Anyway... I got the amp today!! I paid same day of the auction and the seller shipped right away, so it showed up at my house this morning. Went home from work, unpacked it, and plugged in. This is my first Mark series amp, so I'm no expert. To get started I used settings I found here:
http://homepage.mac.com/mesaboogie/MarkIIC.html. The amp is pretty clean... as expected, it's a combo, 100/60, eq, no reverb non-simul. Came in a road case, and it has the STR-415 power tubes. Everything appears to be working well. Only had 20 minutes of playing, but thus far I can say I really like it; seems to have the signature C+ growl. A bit less gain that I expected, I was able to get the lead channel to sing, but couldn't get any breakup on the other channel... probably just my noob status... much tweaking to come, and perhaps some preamp tube rolling.
I'm gonna take some gut shots and post to the vintage forum and let some of the experts render an opinion on the hardware.