I use one and I like it. The biggest difference for me at least is..... With the release on the string, there is a lot more pressure on the release. This pressure is what causes nock pinch. Even with the rubber cushin it's still there because the apex of the string is below the arrow nock. Thereforepressure is applied to the top of the release (caliper style) as well. The shorter the AtoA the more pronounced the pinch/pressure is.With the loop the apex of the string becomes the loop and all of the pressure is where it's supposed to be (centered in the jaws pulling straight out). There are no other forces being applied to the releasemaking for a smoother shot. The other plus is thatthe arrow is being pulled from directly behind the arrow and not below it.

If tied correctly and the proper material used (like Big Bulls said) you should have no problems at all.