I have the mb212, where do I start lol. The first one I had was a lemon, speaker started with a wierd popping sound and than finally amp started smoking, scary. The guys from GK have been great and sent me a brand new one free of charge, they even payed for the UPS shipping. Much better, it has alot of volume only thing I wish it had is a ground lift switch as sometimes you can get an annoying his or static depending on the room or electric outlets. A tuner and a mute switch would have been nice as well but overall, I like the amp alot. Very modern sounding.