I really don't see the appeal of this. You're only saving one point compared to a basic TIE interceptor with better guns. Is PS 4 really that much of a priority?
Well, so far the biggest pro has been more psychological. See, my opponents know how deadly interceptors are (and that's not even saying anything about how i fly them), so they will go for an interceptor from the start. However, those one or two little BSTs just tend to be ignored. They're not flashy or dangerous looking, so they'll stick around for 2/3 of a match before anyone even bothers taking a shot at them. Even when I've lost my more champion-type pilots, the one or two Black Squadron guys get it done. Sure, they may not go around one-shotting everyone out of the sky, but they consistently deliver damage over most rounds and last long enough to keep the party going. Four of the five matches I've used this in, my opponent has said some variation of "you know, I should have killed that thing early."