I have a limited tolerance for fuzz units. It's down to the fact that the guitar's lower notes sound rather repulsive through a fuzz pedal. I hear lots of ill definitions which aren't suitable for heavy music. However, the fuzz is the preferred unit for doom- Cathedral has loads of fuzz going, Enslaved's Isa album has some juicy, fuzz-laden tones for the solos. It has its applications, not for the picky though. The Op Amp version by EHX you see here- I like. It has 2 channels, one giving me that extra prick for leads & that's what I use it for. That setting is quite repulsive if one sports a Les Paul because it makes the overall tone sounds thin.