AcmeBarGig describes C-15 as "insanity controlled". "One turn of a knob lets you know this amp is one step away from being out of control, but the knob itself possesses all the harness required to make sure that C-15 does not lose its head. Forcing a C-15 to hold back is not the best way to treat it, in the real world that can manifest itself in many ways, in the ABG C-15 head it manifests itself in limited tone qualities, Crank it up and let it cut loose, you will be rewarded with a high gain that delivers crisp over tones and rich soundscape. This is a METAL Head, nothing else."