someone said: LIVE USE WITH GUITAR AMPLIFIERS
If desired, you can use SansAmp in live perfomances with a guitar amplifier. It is advisable to have Amp Drive at a lower setting to compensate the higher level of sustain and overdrive of guitar amplifiers. The lower setting will also avoid microphonic feedback. To equalize brightness of live amplification (generally), it is suggested to set High halfway or less
Coincidentally, i found the manual today, and it actually means using it live. Here's what it says...
Personally, I think its much much better when used with an amp. It works fine as a distortion pedal, and the mini switches offer a lot of tonal options. One thing i particularly like, the switch on the side (lead = marshall, normal = mesa, bass = fender) changes how the rest of the settings react with each other. Because things are covered more than once (eg a high knob, as well as the lead/normal/bass switch, and mid switches etc.) you can have a similar sound in terms of how much treble you have, but a totally different tone overall. It's a very very versatile pedal.