The bass fuzz is one of my favorite pedals of all time. The problem with using a guitar fuzz on bass is that you often end up with a filthy fuzzed out tone that has no definition and is completely lost in a mix.
It may sound cool when you play by yourself, but when everyone else comes in, the bass is lost. No one wants that. Our bass fuzz is actually somewhere between fuzz and heavy overdrive. It is full of balls and grit. It explodes with ferocity, but leaves your low end intact.
It's like a heavy weight boxer that is somehow very articulate (like Mike Tyson). Mark from Pavement (and now Sonic Youth) uses this guy, but he is secretly afraid of the volume it puts out. I didn't say that.