Only just started indoor climbing with my children. This belay device is excellent for us because you can use it with the rope over the 'teeth' side for extra friction, or reversed with the rope over the 'non-teeth' side for less friction (Black Diamond call this 'normal' friction). This means that I can use it in 'normal' mode to belay my daughter, who is so light that the rope won't feed through when lowering her otherwise! She uses it in 'high' friction mode to lower me ... who is substantially heavier! Good piece of kit, well recommended by the Birmingham branch.