I use one of those. It works well, but has a couple of issues. First, when using an ATC the wire loop hangs far enough down that it hits the plastic and can be annoying. It's annoying to keep opening and closing when you are doing multiple rappels, so I just take it off and put it my pocket. Also, I had the plastic pop off when it was open and lost it. I called DMM and they wanted $7 for a new piece of plastic. I told them they were out of their minds and luckily I found another one on a climb in Red Rocks.