In short: this pedal can produce classic fuzz tones, from almost clean to heavily fuzzy, from standard to velcro, from velcro to octavia ring mod destruction. But it's dirty, always! Unless on classic fuzz tone the pedal can get pretty smooth when dialing in the Treble knob...
This pedal is magic for bass players: great amount of bass frequencies, good precision, nice grit, but must of all: it has tons of bass synths sounds!
The Glue fuzz is available as full germanium (sweet distortion, with smooth trebles, not far from tubes and on the vintage side) or hybrid Silicon+Germanium (thick, modern, nasty fuzz with more aggressive trebles). Look at the end of the video below for a short comparison.