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
Typical EBOW,octave,fuzz,synth,poly-whammy,freeze-gliss,sample-reduce,MODE 7,flange-chorus,super phaser,FAT-filter,lo-fi delay,cave reverb,lo-fi looper,space echo,Chansey reverb/poke-freeze bassist