I haven't had these very long but I thought I would share the experience at 5000 miles. They are good performing stiff tires and hardly seem to wear. They still have the same tread as 5000 miles ago similar to my last set of run flats (Michelins). The negative so far is even with a luxury class suspension and noise reduction you feel the road bumps like a sports car and hear noise. I don't know if non luxury class cars could deal with the bumps and noise. However, I am sold on run flat technology and feel the performance safety benefits far outweigh the noise and more vibration in the ride. That being said, these are good performing so far, I hope they last 45k miles like my last set of run flats did. So far so good.