I searched the forum, and although I spotted some guys who own the pedal I don't find much reviews and impressions of it.
I am not exactlly looking for a fuzz per sé, I need a booster for solos.
I'll be playing through a very clean amp (I'm still in the market for a new head) and thought a little boost and/or light fuzz might liven up my sound when I want to cut through... more.
Any experience with the fuzz on moderate settings with this pedal? I don't want heavy fuzz, just some adolescent fur on the chest as a figure of speech.

I'm going for a clean uncoloured sound setup most of the time, but occasionally want to color the sound a little bit.
(edit) Additional question: If fuzz is set low, how does the effect react to your playing dynamics? Clean with a light touch an fuzz when you dig in?
Any experience with using just the booster?
Also, what exactly is the "gate"-knob for? And how does that work?
(Big John, for those who don't know him is a member here and one of Belgiums highly respected professional bassists.
He has been kind enough to answer some of my questions in the past over PM. And I would be happy if he chimed in this thread as well. 
But I want some consumer input on the Hairy Balls. Also this thread maybe good for future reference when someone searches on this pedal.)