I couldn't pass it up. Was a good deal I think ($70 bucks), and I liked goofing around with the filter models on the M-9 I had, but I ended up selling that pedal.
I actually think this purple box of horrid noises sounds 'better' than the same models on the M series. I remember the M-9s stuff sounding 'clearer' or 'more controled'. I don't know if this is really the case or not, but this thing is really cool lol.
I plugged it in when I got it home and whatever setting the previous owner had for one of the spots sounds like a psuedo tremelo with wierd modulation... I wrote a song around it already, that's a good sign!
Most people would find these noises repulsive and offensive... to me it's beautiful and fun!
For sure not for use with everything, but will be cool to have on those nights when the wife is out of town and I'm bored and up late lol.