Will probably get 40,000 miles out of these tires. They have been good overall but very hard over bumps and a little noisy. On a Mercedes, they do not give that Mercedes ride, although on smooth pavement they are fine. I would not get them again only because of the hard ride over bumps, ruts and harsh pavement and noise. I have had no problems with sidewall bubbles like other reviewers. I did get a nail in one and it was replaced for free (well not really free since I paid for the wheel tire insurance)without a problem by Mercedes. I will probably get a set of regualar tires and get a spare so that I get a normal ride unlike runflats.