I'm in the process of getting a PDC (parking sensors) upgrade to my May 2013 60 MS. Has anyone else gone for this? It would be good to get more intelligence on it: how much, how long it takes, where the "VIN breakpoint" is, and how much additional functionality is added compared with newer models. I believe that the newest models have 12 (?) parking sensors (4 front, 4 back, two on front/back driver's side, two on front/back passenger's side), plus the forward-facing sonar (?) in the middle of the grille.