This pedal is a treasure. I only recently started to use it as a clean boost which is permanently on. The fuzz can get quite dark. Way beyond I would choose to go, but with low gain and mid tone fantastic rhythmic fuzz can be produced. then you crank the gain up and you can cut right through. If I go to jam at someones house, it's the one pedal use.
Only limited run of these too.
This pedal is the tone of the gods in a box. I use the boost always on through my SF twin to get a nice grit and set the tone almost all the way counterclockwise on the fuzz, with low gain to add sort of a filter when soloing or on choruses.