I have one and its one of my fav pedals ever: it's never leaving my board. I only use passive basses but as fat as that is concerned it reacts VERY nicely to your playing:touch sensitive and easy to dial in.
I use it mostly for its synthy nature: here is a lame video of me playing! http://www.youtube.com/watch?v=YsxqnnbM8Yw
Octave,fuzz,synth,harmonic fuzz,poly-whammy,freeze-gliss,filter,bit crush,tape soup,orbital modulator,hazarai,Chansey reverb,space echo,lo-fi delay/cave reverb/lo-fi loop,BeatBuddy,multi-loop bassist