2011 X5 35i M Sport Package: Suspension

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I just purchased a 2011 X5 35i with M Sport Package (Canada). While I love the vehicle for the incredible drive (and the potential this engine has when Dinan releases its engine software), it wasn't until the drive home from the dealership after my wife and I took delivery that she informed me she found the ride too "choppy" and not as comfortable as other vehicles we had looked at (Mercedes ML 500, Acura MDX). I understand that the suspension in the M Sport package is different than what otherwise comes on this vehicle - an "upgrade" as the sales guy called it. Adaptive Drive is not available on the 35i model.

Can anyone better explain the suspension to me (i.e. is it dramatically different than cars not equipped with sport suspension and, if so, how?). It got a little confusing reading other posts on the subject - especially because it appears as though the packages are structured differently in the US vs. Canada. I am running 19" run-flats and consider myself fortunate I did not upgrade to the 20" wheels. I also equipped the vehicle with comfort seats but doubt this will make much of a difference vs. sport seats.

Further, would coil-overs be an option for softening the ride? I don't mean to sound patronizing but happy wife = happy life. Of all the vehicles we drove, this was by far the best for me (the driver) but now my passenger is having second thoughts. I want this to be a win-win situation. Suggestions?

Thanks.