From the Summer 2009 issue of Mountain Bulletin, the quarterly newsletter of the American Mountain Guides Association:
"Put [the Gri-Gri] in the hands of a lighter, less experienced belayer, add a pair of gloves and you have a recipe for pushing hard on a rock climb with a high level of confidence that you will not be dropped."
--Rob Hess, AMGA Technical Director
This is a surprisingly strong endorsement of the Gri-Gri for use with beginners.