Add it to any respectable riggers belt and you have yourself a rappel harness. Perfect to carry just in case, I work in high-rises and always need a way to get down a few dozen meters in a hurry.
I found out about the ARCH a couple years before I bought it, and now I have one!! It's very well-made. At a glance, it's obvious it is top-notch quality and reliable. I have a Blackhawk rigger's belt that I use with it, and it works fine. Kinda wish I had bought the rigger's belt from Agilite, since their stuff is such good quality. Anyway, the ARCH is really handy, and it barely takes up any space in my backpack. It's also comfortable and easy to use. I like the fact that it has clips on the leg loops so I don't have to put it on like other harnesses that get tangled up and annoying.