For me it's just wasted money beyond a "-" connector. I used to work for the folks that own Lightning Strike. SJC customs is upstairs and I know those guys well. I've played with an $1,800 factory ZEV gun (or was it Salient?) In any case, I've never felt a trigger from any of them that was markedly better than a shot-in OEM "-" connector setup. The Glock geometry just doesn't allow for it. Now, APEX in an M&P? You betcha! But the trigger/striker works differently there.