Thanks, all. The 3M rock guard was poorly done so I'm going to have them check tire pressure when the vehicle goes back in next week. Going to stick with the run-flats for now.

Turns out our friends (S 550/ML 500 owners and Benz loyalists) were planting seeds of doubt in my wife's ear. I know the ride with M sport suspension is going to be a little more firm but I don't think it's bad whatsoever. Tossed her the keys and told her to drive it. She gets it now. Driving is believing. But she did say she is picking the next car. She likes the F10 550 but that's a couple years away so she might as well enjoy the X5.

Appreciate the insights.

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- Carbon Black