I had a pedal like that almost 10 years ago...has a pretty cool sound.
You can run an amp totally clean and use just the pedal for all the gain needed...it has a ton of gain.
The pedal convinced me to buy
the PSA-1 rackmount unit as well.
Here's a mid-gain, rough song clip...all the electrics are direct to board with the SansAmp unit...sounds better using it in front of an amp, but this may give you an idea of how it sounds.
http://www.mp3lizard.com/download.cfm?id=25097