I have iDrive in my car. The nav routing seems a little weird, and the learning curve can be steep, but overall I like it.
For me the one killer feature is the ability to send destinations to the car via google maps (on desktop or phone). I hate typing in destinations, and I much prefer google's POI database to any nav system's that I've used.
Note that there's two different versions of iDrive in our 1ers. The 2008 models (and possible some early 2009 builds?) use an earlier version of idrive and have a screen that rotates closed. Later models have a newer version with a fixed screen and more buttons around the iDrive controller.
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