I've watched Len at MacRotech prove to people how these STS type surpressors can screw up your bow tune. Not only is location a factor but also how hard the string hits. I believe in the past he made his thoughts on these things known on the board but it wasn't well received so now he just stays out of it and lets everyone figure it out for themselves if they're not one of his customers. It's throwing your bow out of tune, just like your quarterbacks arm. After watching Len play with these things I've never felt the urge to have one. They're an expensive gimmick that can only cause trouble. My Darton and Guardian are quiet enough without it.