I came across this a few weeks ago and was curious to hear some opinions. It is an anchor designed for a system where you are using bolt/ring or sling/link that will remain in the canyon. It says it was specifically designed for "descents with unknown rappel lengths." While most situations would work best with the traditional knot/biner block, I am intrigued by this system for drops with bad rub points or abrasion. This system is somewhat unique in that the descending rope does not need to be pulled through the anchor which means potentially less than half the amount of abrasion on the rope than with a traditional pull? Very easy to set up, use, and probably hard to screw up. I just tried it in the backyard about a dozen times- it worked effectively every time. It was a little finicky a couple of the times but I suspect a bit more rope weight would make it work smoother. I am keen to try it out in the real world anyway.