I've experimented with it, and I've found it to add just a little sheen, less than 303 or Meguiar's #40. It also doesn't feel greasy on harder plastics like I've found 303 to do, though you can feel it a little. I didn't really notice the smell in testing but I haven't done a full interior with it yet.
Of things I've tried, I think what it might be closest to is Optimum Protectant Plus, though I haven't tried that enough yet to be certain.
Flattest finish I've found so far for interiors is 1Z Cockpit Premium, which on like-new surfaces doesn't really look like you've applied anything at all and doesn't add any extra slickness in feel that I've noticed. :woot: