I used to use one, but I don't any longer. Sure the loop will save on serving wear, but only depending on what release you use. I shoot with a Scott and I don't have any or hardly any serving wear. I have more wear on the serving from the arrow knock than I do my release. Sure a loop will help or eliminate knock pinch, but only if your pulling a short bow and have a long draw length. In my case, I feel that they are useless. My draw length is 28" and I shoot an Xtec at 35 1/2" and use a Scott release. No crazy serving wear that everyone talks about and no knock pinch. Not to mention you lose a little speed with a loop.