the manufacturer recommends serving the string at impact point....not sure why.....the gain in speed actually comes from removing your silencers....they can rob 3 to 4 fps.....and by removing them you gain it back.....have one on my allegiance and not really worried about the look....no worse then some of the stablizers on the front they make....lol....also seems to eliminate bow jump and torque....makes a noticeable difference.....won't want to be without it....hehe