There's something about the way the C+ grabs the speaker that gives it it's tightness. Playing a Mark IV or V after playing a C+ is annoying to say the least. The IV & V's are great amps and I don't mind using them when I have to, but there's an immediacy in attack with a Mark I, II & III that the IV & V don't have. Plus the IV & V, unlike the lll, run out of gain, useable gain that is, the lll and C+ don't squish up with high gain settings. A C+ is easier to dial in than a lll, but the lll has more varieties in tone and with mods, smokes most amps. The nice bite stays along with the knarly crunch with the lll & C+. The IV and V have too many options for my taste, I spent too much time balancing the settings playing live, kind of like tuning a guitar. I guess I play the amp as much as I play the guitar and the C+ is part of my sound. If I were in a cover band the IV & V would be the choice. It's like this, if you've driven an expensive European car like a Mercedes, BMW, Porsche, etc. that's a IV or V and then drove a McLauren, Lamborghini, Ferrari, etc., that's a modded lll, a C+however, is like driving an F1 race car! Driving a BMW can be annoying on the race track!