Our 328XI wagon came with Continental run-flats. They drove like they were made of steel. Replaced them with Bridgestone Turanza run-flats. Softer/better overall, but still very harsh on bigger bumps in the road, and kind of a mushy steering response. Also very expensive. After about 29,000 miles the rear tires were pretty worn, so I tried the new Pole Position run-flats. These really are the best all the way around. Better handling, firm yet forgiving ride comfort. Not as brutal on the really big bumps. Handling/steering feels tight/precise. They cost less and are suppose to deliver more miles (40,000). They're new, so haven't had rain/snow experience yet, but so far I highly recommend skipping the Continentals and Turanzas, and buying these Pole Position run-flats instead.