Met the owner at the Eastern Sports and Outdoors show a couple years ago and really didn't care for him. He seemed to be very full of himself. He made the claim that it is very difficult to tune broadheads and with these nocks, you can screw on any broadhead and they will fly perfectly. I tried to explain that it is really not that difficult to tune broadheads but he continued to vehemently argue with me.
Nevertheless, my father bought a couple that don't require fletching and he was not satisfied, there was no difference between them and his normal arrows except for the noise. They were incredibly loud. Also, the nocks can only be used with right wing feathers and i shoot left wing so I couldn't test them out.