Not sure if this a great thing or not. If someone can link the car to you and your address, so can the thief whom broke in to your car and possibly steal your house keys if you left them in in there.

Besides my windscreen can be pretty crowded; Car parking sticker, German environment sticker, Swiss Vignet, sometimes the Austrian Vignet (or two!) and satnav.

Could be even more, I still take the toll boot for the frensh Péage instead of getting the transponder which fits on you windscreen.