The Ross Distortion pedal is really simple, so there isn't too much that you need to know in order to use it. The only two parameters that it has are for distortion and level. Even if you know nothing about distortion pedals, you should be able to figure out how to use this without any help from a manual.
The sound quality of the Ross Distortion isn't outstanding, but it's definitely more than useful. It's fine for use either for live shows or in the studio, but there are definitely better sounding distortion pedals out there with more versatility. Having said this, it is possible to get both heavy and more subtle overdrive sounds from this pedal. I would say that it's best at getting a thicker type of sound somewhere in between a heavy distortion and an overdrive sound.
The Ross Distortion pedal wouldn't be the first thing that I would recommend if you're looking for a distortion pedal, but that doesn't mean that it isn't a good pedal with it's own color. I'd say that it is most useful as an extra distortion color rather than a go to, main distortion pedal. If you're able to find one, I'd definitley recommend checking it out, as it should generally be cheap enough where it might be worth adding to your rig...