This sounds like a muffy fuzz we all know and remember, however it is pretty much a one trick pony.
The sustain knob does not have a huge range and it basically sounds the same from 9 to 3 o clock and never really cleans up.
Tone range is usable, however the pedal itself has a lot of low end. Volume works as expected, however I am not a huge fan of the small knobs.
That being said, it does the saturated muff thing pretty well.