If you want the smoothest x3 ride avoid the sport package and stick with the 17" higher profile tires. The handling is still great. This is all the advantages of a truck in a package that drives like a sports car. Nav system is easy to use and pops up out of the top of the dash. Upgraded sound sytem sould be a little better but isn't bad. Seats and driving position are great but the bottom line is the x3 is just plain old fun to drive.