I have navi in my 550. I was not expecting much when I got it, given the bad reviews it generally receives, and at first I did not like it at all compared to the Acura system in my wife's car. Now that I have used it for a couple of years I actually prefer it to the Acura system. It is not all that intuitive and takes some getting used to but I think it is fine and for me and preferable to an aftermarket system. I ordered it for my impending M3 without hesitation.
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