One of my friend's wife put dome V&H Cruzers on her Yamaha VStar 650 and they sound great, they are quiet at low throttle and really crack when she opens it up.
V&H lost out early - slip ons would be really cheap to make available for us from their existing stock, just a matter of changing one bracket, after separating the two mufflers on the clone bikes.
Personally, I don't want them.