big muff is like a fuzzy esque thing. but hot tubes. UNBELIEVEABLE. absolutly amazing o/d. there may be better ones out there from some small company but this is a great mainstream. it has a warm warm warm sitting by the couch sound so that the sound is "real" like you can stroke it and have wild sex with it. and it plays like no other overdrive in my opinion. Big Muff i'm not such a fan of. It may be analog but there are much better fuzz's out there. save yer money and get the hot tubes, you wont be disapointed, it OWNS teh blues, fusion WOW, instrumental vai style? i wouldnt know i'm not good enough lol. Metal, Hell yes, with complete articulation, none of that crap where you fuzz over everything and you cant hear the notes. Rock is its best point. I just can't believe what a good rock tone it has. Through an all tube fender amp, or marshall stack its a total love box. you should get it for a pedal. you will have no regrets. i wish i had one. i only play it at my freinds house.