Well, according to this article our 'prom-queen' CLA45 has the street manners of a 'professional lady'. (Yes, I know this is the A45, not the CLA45.)
All street cars have to be a compromise on the suspension setup. They have to be somewhere on the line of: Racecar > Track car > Taut driver > Softer driver > Lincoln Towncar. I have found the back seat of a towncar a great place to be on the streets of Manhattan, but that is not what any of us expect in an AMG car.
In my personal experience, I have many years of racing, and I had an '04 M3 for one year. The M3 was "sprung" too softly for people who were looking for a SERIOUS track car, but too stiff for me because I wasn't looking for a track car. I continue to hope that this car won't end up too much of a 'wanna be' race car. We just have to wait until November.