My March 2011 520d came with ContiSport Contact 3 SSR 18" and is absolutely fine.
No complaints here. Yes, the steering feels a little light but that's just a characteristic of the car... In no way would I say it was "dangerous".
I was a bit disappointed with the lightness of the steering when I first got my car but it was a damn sight better than the demo 520d I was given many months back which was a much older F10.
EDIT: My car is on the standard suspension - I dont have the fancy VDC or whatever the heck it's called (company car with limited company enforced options budget