I have both. I didn't order mine, as it was on the lot. Had I ordered, I probably wouldn't have had the 20s. Now that I've owned mine for a little over a year, I am glad I have both.

The comfort seats really make a big difference to me. The 20s distinguish my X5 from all of the others I see without 20s. I do not find that the ride is harsh, and the noise is non-existent. I do not, however, like run-flats. (Mostly because I cringe at the cost of replacement.) But, it is a $70K vehicle.

Joel