It's pretty 'meh' in my opinion. At the end of the day, i'd rather nav than no nav, but there are systems out there (built in and stand alone) that are much better. Every now and then mine will act screwy and freeze, but with some stern talking to it works again after a minute or so. Idrive is....an acquired taste.
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E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII
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