Bought the Michelins to replace the Bridgestone potenza RE050A that were OE on the car. The Bridgestones (treadwear of 140) have a really stiff sidewall, so stiff ride on an already really stiff suspension, but great steering responsiveness. But lasted 15000 miles to the wear bars. The Michelins transformed my car from an eager feeling (like a cheeta ready to pounce) to a more relaxed ride. The ride is definetly softer, but I lost some of the steering crispness as a trade off. OK for a daily driver. Don't get me wrong, it still responds quite quickly, just not with the right now feeling of the Bridgestones. Altough I don't autocross my RX8 (I'm more of a track guy), I'd probably go back to the Bridgestones if I was to do that type of racing. Great traction in the wet, just watch out for the painted lines when wet; they get very slippery. The side walls go inward (at least with my size: 225/40/19), meaning the contact patch is actually narrower than the rim, leaving the rim with no protection. Reasonable noise level for a tire of this category. With a treadwear of 300, I was expecting to see about 25000 miles before wear bars. I got 15000 with 2 tires left with no middle groove at all, even with 32psi (not overinflated)checked every week. Rotation done every 6000 miles or so. As for the 30000 miles waranty, forget about it. I was told that I would have to prove (with writen document) that tire rotation was done (I have no proof, I do that myself), plus proof of an annual alignment. I have more wear on the inside shoulders due to the aggressive alignment (wich is within Mazda spec for my car). Every sports car is aligned with some positive camber, these are not minivans!!! I believe that the traction is so good due to the fact that this is really a 140 treadwear tire. So expect the same milage as a 140, whatever that may be in your case. I do drive very aggressively in corners and high speed (above 110) on the highway. But I love the tire, new set on the way.