Pretty cool ... developed in the White Mountains of NH which is one of my favorite areas for hiking and camping. Pretty sure the photo of the guy carrying the dog up a ladder is the Hi-Cannon trail on Cannon Mountain.
It is worth considering as I had the awful experience of Cassie tearing her CCL while about a mile from my truck. When she laid down in the field crying, the first thought I had was how am I going to get her out of here. It took us the better part of an hour with me carrying her part of the way and her limping along for some of it when I ran out of gas.