My personal opinion is that usaully the ubar "metal pedals" (like the metal zone) don't usually do so well. More distortion doesn't necessarily mean heavy tones. I you listen to S.O.A.D.'s first album the distortion really isn't to high. (sorry it's the only really good example I could think of at the time) Anyway, usually I stay away from the pedals that are commercialy marked "metal." just try different stuff.