Go-to Belay device
My climbing partner mentioned that when he climbs with his kids, he always have them belay with the grigri. Not only is it more safe and secure than a regular belay device, it helps him focus more on the climb than whether his kid will drop him or not.
Personally, I use my GriGri mostly in the gym, although I have belayed some friends outdoor while they were lead climbing. It works perfectly and I recommend it to all climbers.
Disclaimer: It is good practice to learn how to belay someone on a regular belay device such as a Petzl Reverso or a BD ATC Guide, since the GriGri is NOT a hands free device!