I wasnt a real believer of this product at first. I have an '05 Illusion and tried one after a year of a bud bugging me. The bow has virtually no shock to begin w/ and is very quiet. I added one. And to my surprise I felt a difference right away. It was dead quiet and made my bow feel as if it were shot out of a hooter shooter. The little vibration I had was depleted quit a bit. I now have 4 of them on all my bows !!! They do work!!!