NorthEastern Ohio got slammed with Lake Effect snow today and I had to take my swimmer to practice at 5:15Am with regular Z51's on board...and then later get my previously purchased AS Z51's installed by my dealer. The difference in traction was to be expected but he difference in ride quality was startling. First of all NO TIRE HOPPING on tight turns, and and overall much smoother softer ride....almost cadillac like. They should come standard on the car with the regulars as optional. one caveat....no AS Michelin Z51's run flats yet. Snowy roads with the AS's and weather mode was no problem.