Nan W. 
2015 BMW 3 Series Sedan 328i xDrive 4dr Sedan AWD (2.0L 4cyl Turbo 8A)
Disappointed with Comfort
 I will start by saying I own a 2014 328xi.  I love the acceleration and the way the car handles.  The gas mileage is phenomenal!  My problem is comfort. I have taken this car on 2 long trips and both times came home with a herniated disc.....L4,L5.  I was not doing any heavy lifting so I know that was not the cause.  My chiropractor said that he has many patients who own BMWs in all models and herniated discs are a problem.  He has even written BMW about this.  If BMW can make such a wonderful car mechanically, why can't they make a comfortable one??