Have to agree with oneshot7, it is mostly the person. I do however, believe that some things are better then others, and it can improve what you are already doing. My example, and it is only me, I put a Dusk Devil II on my bow two years ago, the groups got tight and I split my first arrow. That told me that the other sight was not right for me. Not as good as, but better for me. So I think it is the shooter and like patterning a shotgun or something, sights, stablizers, etc, bow, help to improve what you are already doing, just better for you, if that makes sense!