Be careful when choosing a 3-series. One of my e90s doesn't have iDrive/nav and I can hardly stand driving it due to how fiddly the radio interface is. That is the wifey's car so I rarely get behind the wheel but when I do, it is like I am in a completely different car. It is less about the navigation than it is about the radio and phone for me. Driving in the vicinity of the speed limit is very boring, I need to play with the iDrive to pass the time.
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