I play mainly blues/blues rock, and like to have a clean sound that is just pushing over the line, so has a bit of break around the edges. This pedal responds nicely to dynamics. I'm able to set it fairly clean, but with a bit more pick attack I can push into into a light breakup overdrive. As such, for the tone I like, this pedal performs perfectly. Right now, for my preferences, the Wampler Euphoria or Nobels ODR-1 are better for my desired sound.
It drives well with the gain turned up, and is a pleasing sound on my tube amps (Marshall Class 5 and Fender Pro Junior which I keep at clean volume levels).
I no real criticism of this pedal. It does everything it's supposed to, and I do like the tone, it's just that right now I have other pedals I prefer with my amps. It's definitely well worth trying out, though, and may have perfect for tone you and your setup!