I know with the BOO string I can hear my arrow from the CB end! Was pretty impressed with it the first time I heard it. But I have also heard that the Nap Quick spins are on the noisy side as it is. From what others say the STS does not affect FPS, and the little that Don's cat whiskers slowed down my arrow it is no issue for me. I also like the fact that maybe my neighbor will not come walking aroundhis garage with that funny look on his face after my first couple of shots.