They're used still by Strongman lifters. They transfer over well to things like the stones, Conan's wheel, yoke, etc.... The main problem is forearm pain, if you have a thick bar handy, use that, it helps.
Zercher is probably 70 plus years old in that photo and definately unjuiced. He could probably have made a bitch out of most lifters 1/2 his age. Just a thought.