I bought a set of Michelins for my Excursion and inside of the first two weeks I had a repeated low tire on one and a tread seperation on another.The low tire was from air escaping through the sidewall. I took the car back and the dealer gave me a full refund for all four and I had him install Toyo AT's and never had another problem.
One item that a lot of you never take into consideration is how often has that tire been curbed when going around a corner. That is an item that can really ruin a tire in a big hurry and not just the sidewall,but the tread and the wheel
I drive a school bus and used to have a supervisor who could see a curb mark a mile away when we came back into the yard after a run. He'd make you go out with the driver trainer after seeing several of them. Very embarrasing.