I've been using iDrive since 2010 and I find the BMW Nav to be the best OEM system available (I don't like touch screens or systems that won't let you enter addresses while the car is in motion, even by the passenger). There is a learning curve but once you learn the quirks it is a great system. Using voice recognition to enter addresses works well as does google search using MyBMW App on iPhone to send to iDrive.
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