I followed one of Dain's slip-ons today that happened to be mounted on a new, 2014 Roadster owned by dmaint67 (Dave), who hails from NE Philly. Personally I like the sound of it better than stock, Dain's build quality is top notch, Dave's bike runs like the proverbial raped ape and he is far from a dainty man.
From what I saw and heard, Dain, you not only earned that "A" grade, you are offering folks a fantastic option that's also an outrageous value!