I'm all for tubular belay devices for rappeling, in fact, my figure 8 spends most of climbing days in my pack, and I never use it for belaying. That said, sometimes figure 8's are kinda... fun... If you know what you're doing and have a leather glove on, you can zip down a rope on an 8 in no time! Also really cool to impress people that have never used one. Also fun to do "SWAT" or inverted rappels with a figure 8.