I got my GK MB212 from the brown truck on Friday afternoon. I used it on a gig this weekend and it seemed to really do the job.
It sounds a bit different than my SWR 750 into an 8x10 but I surely didn't miss the volume and punch. It might take a couple of gigs to get it dialed in but all in all it worked great.
I did have a minor scare when all of the sudden the amp cut out. I thought it shut down on me but it turns out that we had too much stuff on one circuit and the breaker tripped.
What a bad a** little amp.
At the end of the night my guitar player came over and picked it up and told me FU and walked away.

This thing weighs less than my rack.