The 2017 itcc ascent tech brief mentioned it, but I'm not sure it's still ok.@TimBr
It creates friction with a bend inside the device rather than a moving cam. The release action is using leverage to rotate the entire device on the pivot of the carabinier so that the channel that the rope is in has less friction. Kind of genius.
I don't know, but I would like to be able to run it. I have a month to figure something out, and hopefully something as fast as the taz.