I was up a tree this afternoon using RADS with my rock climbing harness and I found the foot ascender worked fine to pull on the tag end of the rope after passing through the GriGri and pulley. I later decided to try my sitdrag to do the same thing. I felt myself slowly slipping from the sitdrag about 20 feet up and it was not a comfortable feeling. I now know specifically what the leg loops are for. A saddle with no leg loops is fine for standing on a platform and leaning. It is not so good for hanging from a rope 20 feet up. I did have a heavy duty nylon belt around my waist so slipping from the sitdrag would have left me hanging with the belt up under my ribs. I am sure I would have escaped uninjured. I quickly unhooked my ascenders from the top rope and my foot and rappeled down with the Gri Gri.