Posting as a follow-up to an earlier review. I've owned these tires since May, 2013. Unfortunately, after the 2nd rebalancing attempt by Costco, I was past the 30-day warranty exchange period. Spent $160 at the top balancing shop in early July, trying to get the vibration issues sorted out. Had them check the suspension for wear or damage - none found. They 'matched' the tires to the rims (high to low) and checked rims for true - everything was perfect. At or above 50mph, I still have vibration in these tires. Called Bridgestone - that was a waste of time - 'you are out of your 30-day guarantee period' but if you have less than 2/32nds of wear on the tires, we will replace two of them for ride disturbance. All four tires have been rotated around each time they have been rebalanced - the problem exists with all four tires. Very disappointed in what is supposed to be a 'premium' tire. The problems started the day they were put on the car - shame on me for not making Costco replace them after the 2nd balancing - but shame on Bridgestone for making such a poor quality product. If I weren't throwing $900 out the window (after buying the tires, mounting/balancing, road hazard, and the body shop expense), I'd replace them today. I also noticed a 2 to 3 mpg drop in fuel mileage over the OEM Michelins that came on the car (and lasted to almost 60,000 miles). Never again - it'll be Michelins or Yokohamas from this point forward on any of our vehicles.