A supposedly original analog fuzz circuit designed by Boss. I honestly don’t really know that much about the design of this one, so I can’t speak to how similar it is or is not than other things out there. It‘s silicon and has two modes. Cleans up well off the volume pot of your guitar and also still holds up at lower gain settings on the pedal, more overdrivey. The fact that it has a fairly rangey EQ knob and two distinct modes makes it pretty flexible for those not trying to have four fuzzes on a board. It’s definitely less woofy than a standard fuzz face, but not quite as aggressive and brash in the high mids as a tonebender style fuzz. It also doesn’t seem to want to gate/splatter for me at least. Oh, and it has a lot of output on tap if you are looking to push you preamp.