I just got this yesterday because I had real bad twang in my string and alot of hand shock. It was never there before, but couldn't figure out what was wrong. I went to gander and asked if I could try the String Tamer and the very first shot I took I was amazed. It was like a whole new bow. The bow techs looked it over and watched me shoot to make sure there was nothing wrong with the bow, but came to the conclusion that the string was just traveling too far forward. Anyway, it is an awsome product if you have any string noise or vibration. An instant fix.