Had it on my 2013 slk when picked up from dealer but took it off a few days later when with the help of this site I realised just how much data goes back to Mercedes. Seemed to me that it was more for their benefit than mine.
FAR easier to enter addresses on. Great to check if the dealer is suntanning your car or actually working on it with tracking turned on. Ask me how I know. Biggest problem is it's down a lot, so enter addresses way in advance.