I just started using a string loop for two reasons. (1) shooting a 34" ATA bow and not using a loop gives more probability for nock pinch and is harder on the serving in my opinion. (2) just because I wanted to try it.
I am more than happy with the loop although I have one important need and concern. I HAVE to learn to tie my own loop and do it right! Driving to the shop every time I want to put on a new loop is not something I want to do every time, and its something I need to know.........sort of like if I am going to own it and shoot it, then I am going to know how to work on it.