This thing does affect the sound, eliminating the overtones well, however my delight with it was put off by the magnets inability to hold onto my snare rim. If I wouldn't tape the damper down with tape it would throw itself off from my snare almost every 30-60 seconds - I don't usually see myself as a heavy handed player either, playing with 7A sticks usually.
Regardless it holds its place on my snare, although with the assurance of some duct tape. It does its job okay.