For a long time I ran a GK 700RBII thru my 2 Avatar SB-112 Neo cabs. A match made in heaven. But G.A.S. got the better of me and I took a huge risk and sold my 700RBII and bought the new GK MB-500 (3 lb. 12 oz.) head. I guess I got lucky because it is wonderful and I have no regrets( and no problems). So as the G.A.S. became chronic, I had a little extra cash and bought a MB115 combo from RMCaudio. It came yesterday, and since I had read alot of posts about "rattling", the first thing i did was tighten every screw on it. I then took it to practice last night. I play in 2 bands and last nights practice was with the "young" band. A loud drummer, a 100 watt tube amp lead guitar 412, a 60 watt 410 tube amp rhythm guitar player, and a singer. I proudly plugged in my 115 -200 watt combo and never put the master past 10:00. Another thing I checked was the onboard D.I. thru the PA, I didnt play with it that way, but just wanted to see if there was any unwanted noise. It was dead silent even when I turned the master to 3:00 and had the horn engaged. Sweet. After last night I feel I could gig with this amp anywhere . W/O the use of the DI for say 150 people or less. With the DI, anywhere. But my MB500 and 212 stack will be for most gigs. The MB115 will be used in the practice room and maybe some smaller gigs, or as a backup.