Michael Brooks wrote a review of Petzl Grigri Belay Device on October 25, 2008
I bought one of these primarily for taking new climbers out climbing, that I did not fully trust on a tube device. Which I started using it for top rope soloing and occasional easy solo lead belay (Do not recommend, may not lock off in a fall past 5 feet.) But I have to say this thing is heavy, it is about the same weight of a BD #3 cam. I would rather have the cam over this on the rack, I can take two tube devices and still have less wieght on my harness, then if I took this. Also, it only has the capability of one rope, so if you plan to do a double rope rappel, bring another device for the rappel. If Petzl makes a similiar device for two ropes and a bit lighter, then it may be a better bet of being on my harness all the time. But as of now, it is in my guiding rack.