It's like distortion for fuzz lovers. You can dial everything with vol, tone and gain, with a little help from 4 different presets. It like RAT with a Fuzz Face in the heart. In OFF position (tone knob's also off) is like FF, which you can tame with just volume and tone knob on your guitar. My favorite is 2, which together with the tone knob, makes that nasty garage sound we all like.
I always keep pedals, which are inspiring and this pedal is highly inspiring...
Buy it, enjoy it, keep it ;-)