i took delivery of a X3 M on June 1. The suspension, even in comfort mode, is overly harsh, chatters and bounces the car around. It is unpleasant to drive. I actually tried to return the car, but it was going to be expensive. I also have a 1970 911S and 2011 911 S. Both of these cars have a better ride than the BMW which is surprising. The X3M suspension is just not right. I have asked the sales manager at Valencia BMW to contact his BMW rep about a possible fix, have not heard back. If anyone knows of, or learns of a suspension fix, please contact me.
sas@sasdevelopment.net