sherbertwrote a review of Petzl Grigri 2 Belay Device on December 13, 2016
Familiarity: I've put it through the wringer
I've belayed with a Grigri for well over 5 years, since I climbed with a girl who took multiple whippers in a row after clipping the first bolt. The webbing of my thumb would get sucked into the ATC and even though I never let go, it really hurt till she got back onto the rock. Using a grigri is easier to belay people who are projecting also, just keep hands on brake strand even when just hanging around. Lastly, I had a climbing partner who outweighed me by 90lbs and when he fell I got pulled to the first bolt, where the GriGri stopped his progression downwards (I slowed him down, but he still went down). With an ATC, the rope could have kept slipping, or I could have dropped it (although I would do everything I could not to). Unlike other light belayer/heavy climber teams, I insist my climber clips the first bolt and not skip it. That way I can get stopped by the 1st bolt by the gri... if I were pulled up to the 2nd, then the climber has to be much higher before he can fall without hitting the ground (even if it is a slowed groundfall).
I still use an ATC for rappels, and for multipitch trad climbing when my partner and I can't hear each other (pulls up rope really fast to signal to me at belay). Only downsides of the Grigri is can't belay double ropes, and also the people who give it a bad rep by making it a no-hands device (but better than using the ATC as a no hands device), or pull on the climber side.
Call it overkill, but I have purchased multiple backups of the grigri2 (at work, at home, in car, at friend's house) in case mine gets lost or stolen, I never want to be without one.