I had run flats on a 2006 Viper, which were terrible when cold and took a while to warm up, and they were as hard as rocks. I hope my soon to be delivered 135i will have better ones!
On the other hand, my 2006 SLK350 had better run flats albeit the power was a lot less than the Viper so noticing them was not the same. I did have a flat on that car and the tire kept enough air in it to get me where I needed to go with no worries.
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