The loop does not add to your draw length, that is what it is. What it will do is change your anchor point further back by the amount of the loop. The pro's are less wear on your string, less pinch, pull straight behing nock, no twist. The cons are changing your anchor point. If you were to setup a poll and ask who use them I would guess 80% shoot with a loop. I have gone back and forth on this and presently use one.