I have the regular sized Metal Muff. Solid overall pedal. Brings the distortion, super aggressive and gives any metalhead what they will need. I've heard this one compared as a much more aggressive version of the Boss MT-2 (which is much more lofi than the metal muff). Basically compared to the Germanium Big Muff (which is more rock oriented) and the Big Muff Pi (Fuzz all day) this one is going to take you into a world or metal tones more than any other "Muff" on the market.
I originally bought this pedal thinking it would give me a Jimi Hendrix kind of muff sound, but was very surprised when I went home and plugged it in. If you are in a metal band or enjoy metal music this is the perfect pedal for you. I suppose i should have copped onto it when i saw "METAL MUFF" written on it. Anyway I believe there are three versions of this pedal, the pocket size one, the normal size one and the large one. I have the normal size one (the one in the picture.) ON the pedal there is a switch that says "hi" "lo" and "off" this controls how insane the muff is. the "hi" setting allows you to sound very distorted and gives you a "metal" kind of sound. The "lo" setting gives you more of a cream/Jimi Hendrixy sound but still very distorted and a metal sound, and you can guess what the off setting does, it turns it off. there are three other settings which are Volume, Tone and distortion. The volume controls how loud the overall sound is. the tone controls how muffled the sound is and the distortion controls how insanely distorted the sound is. Overall though, I am not a big fan of this pedal, still a useful pedal though!