Im trying out 2 of the ASAPs now, one on my AR and ther on my sons. Once a sling is attached I dont have any noise issues with them.
But w/o a sling attached they are noisier and have a habit of swinging the single point attachment around getting involved in your grip on the pistol grip....
All in all so far we like them, especially when performing off hand drills w/ sling attached. Allows really free movement from one side to the other.