i had an xi velocity you know the miles keller model with the v max cam on it , well during one day of heavy shooting at the range , during a smoke break ,i was out in the shop ,talking with the owners ,when we hear a boom come from the range, no one else was there at the time , so when we went to see what it was .... the string had broke on my bow , that was the last time i shot that bow (i had various other problems with it ) i sent it back to xi and they traded me even up for the velocity extereme the v max replacement. we found that the rest was set back too far causing the string to wack the adjustment screw on it and that' s what was cutting the string!causing it to break.[X(][X(] thank god no one was injured!the rest was a 3d rover by the way and the bow had a small brace height i don' t remember what it was.