James C Wattswrote a review of Metolius PAS Personal Anchor System w/ Element Locking Carabiner on July 12, 2009
I use this for anchoring to bolts at the top of single pitch sport climbs, which it works quite well for. Probably my favorite application of this is for extending my belay device for rappels. I clip my belay biner through *both* the first little hole and the first "chain link", then when I'm ready to rappel I simply clip the PAS biner to my harness waist loop, creating a secure and redundant connection, which will keep me safe even in the (extremely unlikely) event that my belay loop or this sling fails. Also, this makes it easy to clip my "third hand" prussic directly to my belay loop. Note that this is not really designed to attach to anchors for belaying on multi-pitch routes, as the rope that is already tied to you is far superior for that purpose.