I ran the Grabber A/Ts on my Nissan pickup years ago. Really solid tire. Almost the exact same tread pattern as the BFG A/T KOs - decent in the rain, good in the slop, great in the snow. Wore like iron, quiet enough on the road, and really not much to complain about. The Nissan was my work truck so it was always loaded with tools or lumber or something.
IMO, they're pretty comparable to the BFGs. The only reason I chose the KOs over the Generals for my K5 was that the BFGs were on sale at the time. If I were to do it again, I'd probably go with the Grabbers and save myself a few $$ per tire, especially for a DD that only sees some offroad use.