From rubber soul to sgt peppers and even yardbirds and early zep, the vox tonebender is a bright, nasty fuzz tone that has surprisingly smooth sustain. It does 1 thing really well and that is to split the difference between a fuzz face and a maestro fz1 (I have owned the latter and made clones of the former in both Ge and Si). These are readily available and regularly cloned. Highly recommend this circuit for guys who want mean fuzz tones as opposed to smooth hendrixy or gilmoury sounds. Its got lots of vintage fuzz quirks, but that's the fun of vintage fuzzes. This is the only fuzz pedal I have owned I would never get rid of. I ditched a 60s maestro, a script logo mxr blue box, a univox superfuzz, a tonebender mk3, a mosrite fuzzrite, many big muffs and variants thereof. The 4 star rating is because this is a one trick pony and that trick is so retro as to be cliché sometimes.