I have put these tires through the worst conditions a driver could possibly drive in, and they keep on trucking. I drove my Yukon through ice and white out conditions up Bluit pass in WA towing 3000 # trailer without 4 wheel drive and didn't have any problems.
I have 100's of dirt road and wash board miles on these tires and haven't haven't had any loss of traction.
I plowed through 2 feet of snow up mountain roads and these tires stick like cat claws. I have 30,000 miles on these tires and they have barely have any signs of ware. I will be switching all my vehicles over to Yokohama tires if the rest of the models perform as well as these.
My only complaint with these tires is they don't handle as well in the corners as the stock tires, but I also went one size taller than stock and its a SUV not a Porsche.