I find this pedal to be an underappreciated model from boss. as the name says, this pedal is almost 99% metal tone. This pedal has separate dist & gain knobs(!) U can get a slightly creamy tone with dist knob fully down & only adding some gain. Turn up the dist & suddenly its a head crusher. When used with a tube amp, this thing delivers unbelievable crunchy power. I've tried playing it into the overdrive channel of tube amps & the pedal pushes the overdriven tubes with its own colors to deliver some metal riffs which will disembowel your audience. Another plus point is that tone & bottom controls are separate. which means u can turn up the tone to be fairly bright but also add deep bass with the bottom knob.