As far as I am aware, these just became available here. For example J&G added it to their catalog less a month ago. That's likely one reason there aren't too many people with an opinion/experience with it. On top of that ISSC is a relatively obscure manufacturer to begin with, not that they have a bad reputation, but they certainly can't/don't generate the same kind of buzz that other manufacturers can. That may account for why these aren't flying off the shelves. Incidentally, there are two user reviews on this gun on J&G so far, both seem to be pretty positive.
"My momma, she done told me, there's heart and then there's hate
If one of 'em's inside of you, the other one, it aint."