Its loud!
This humble pedal has three modes;
1/ Fuzz I
2/ Fuzz II
3/ Clean boost
I switch between the two fuzz modes using a Marshall MG amp on a clean setting and my Frander Jagstang. I use some looping with a DD-6 as well.
Knowing Behringer this is possibly a clone, i'd like to think it was a clone of the Univox Superfuzz that Mudhoney used on their earlier albums. It can certainly give you that sound along with other stuff. Even the clean boost is a monster!