The parameters found on the Ibanez SD9 Sonic Distortion are minimal and easy to follow. If you've ever used a distortion pedal before you'll recognize this make up - tone, volume, and distortion. That's all there is to the pedal and you'll see that it's a very popular configuration. There shouldn't be a use for a manual with the SD9 as it's super simple and easy to use.
While I can't say that the Ibanez SD9 Sonic Distortion would be my go to distortion if I had one (hence why I don't have one), it does have a unique sound that I can see being useful in some situations. It's a transparent sounding distortion and I'd guess I'd liken it to something like the sound of ZZ Top. It can get a pretty good amount of gain going on if you crank it up, but I probably like it best at a lower gain and for rhythm guitar parts.
The Ibanez SD9 Sonic Distortion isn't my favorite distortion pedal but I see it's value in a studio setting or if this is the sound you're going for, for your live set up. The pedal isn't too expensive, but I do think that for this price used you can find other more versatile distortion pedals out there. It's worth a try to see if it matches your sound as it is good at what it does, it's just not all that versatile.