Which Dueler did you go with? I just put some H/L 400 RFTs on, as I found a great deal on some barely used ones that I couldn't resist, even though I don't like buying used tires. The guy I bought them from told me that these are OE on newer X5s, but I'm not sure about that.

I haven't had a car with run flats before, and I'm not sure what to think yet. They are HEAVY. Added at least 5 lbs. to each wheel, and I felt the difference instantly. However, right after I got them mounted, I managed to get a flat Miles from the nearest tire shop, so it was nice to be able to drive home. They are also relatively quiet and should last me a long time. I hope their grip in the snow is OK...in a few months that will be the ultimate deciding factor on whether I keep them or not.