After haveing a string loop come untied last year when draw on a deer i decided to try the ultranock(XL) and i like it a lot. I had no problems with it,, the only wear i could tell was that the paint wore off wear the jaws set on it,,but had no sever wear on anything,,,the only downsides i found with it is that it is heavy as other have said and they will make your bow louder,,do to the extra wiehgt in the center on the string
just my .10