I can personally attest to the effectiveness of this belay. My friends and I have climbed on it quite a bit and it catches any fall easily. I personally think that lowering is easier with the Smart than with a Grigri or Cinch. Also, I prefer lead belaying with the Smart. I have some friends who prefer GriGri, but...just a matter of preference. I feel this device feeds rope easier for clipping. This is most noticeable when the climber is pulling for a clip. Overall, I like using the Smart. It is light, small and has no moving parts to worry about.