I used an 8 for a while. Belay extremely well in plate mode, but the damn thing slides down the rope when you belay someone up a climb, facing out. They do twist the rope, but so does any device I've tried. Now I use the ATC, it's light, simple, and works well. As for Grigris, they do encourage bad belay habits, but if you ever give me a belay on Chain you'll want one.