Before xmas, when it was freezing my wife hit some ice i the M135i - the car started to skid then found some grip. If she had carried on, she thinks she could have hit the car coming the other way.
Therefore i think my winters have already paid for themselves!
Then in the 5er, we drove down to the inlaws at night + freezing fog and the extra feel/safety gave me a nice warm comforting feeling (as all the family were on board)
M6 & Family 5er