i have used the trufire 5 star center knock for years. i really like it as far as wear on it or the release, but it does seem to be hard on the string and cable. it appears that it slaps it with every shot, and i'm sure causing a little more noise than a string. but i really like the reliability of it, it's never slipped the release, or dropped an arrow on a letdown. i guess i can handle a new string each year due to the wear and tear from it, otherwise i'm happy with it.