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I have it. It's very nice to have an integrated solution. Use it for a day, and you've pretty much mastered it. I did not order it on my 135i, since my cellphone (HTC Kaiser/TyTNII) does a better job at navigation than the onboard nav does. I just couldn't justify the expense.
If you frequently use it in your current car, and can't do without it, get it. If you're a Sales guy and frequently get lost using maps, get it. If you only need directions occasionally, skip it. There are better and cheaper options for intermittent usage, that you can transfer with you.
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