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I second ibimmer346's description. My thoughts exactly, which I was I sprung for it again after previously having it on my E60. It is new more useful than ever with the iDrive and tech updates: lane departure appears, as well as the extremely useful nav exit lane identifier (which basically tells you what lane you should be in on the freeway to exit or not).
I highly recommend this feature if it is in your budget. And to comment on people who think it is distracting, after driving for a while with it, you often don't notice it anymore, but when you need the info, all you need to do is refocus your eyes. Oh yeah, and if you really don't want it on...you can turn it off.
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