NEW used AMP DAY FOR ME! First one in... 10 years? The GK MB 500 is a tremendous amp. Compared to the Auilgar Tonehammer 500 I just got, it's like apples and baseballs. They are both versatile amps in their own right, but their sounds couldn't be more different. I might actually call them night and day... Even with the treble knob all the way down on the MB, it's still got more air on top than the TH. I have a lot more exploration to do to get a handle on the gain / drive / mid knob interactions. But I was easily able to dial in a tone that I liked within seconds of plugging in. It's louder than expected as well. Next rehearsal is Thursday but already just messing around I can tell it's got what I remember and like from the one time I gigged on one. Super smooth sale from @Deepwoods -- thanks again man!