This thing is small, I can put it everywhere in the pedalboard. It's a really good pedal. It has got 2 or 3 usable sounds (unless you do strange things). So there isn't much to tweak. I like it with vol at 9-10, and wave fully CC. Very classy smooth fuzz sound.
Oh I've got even the mastotron and the fat fuzz factory. The FFF is a different beast, that I love. The mastotron it's actually quite similar...more tweakable (the tone and the switch could make the deal), BUT the sound of the fuzzolo has got something better, I couldn't get the same identical sounds from these 2. The mastotron has the switch, but the fuzzolo has more midlow frequency, and it's smoother.
Finally, it's much compressed, you have to set the amp eq / booster eq well focused to sit in the mix. On the other hand you have infinite sustain.
PRO: handling, a pair of really good sounds, size. Quiet. Smooth sustain.
CONS: not tweakable, much compressed, doesn't behaves good after a buffer (as each zvex fuzz).