I had a 135i w/o idrive, and regretted it from day 1. when i got my 1M i made sure to order it and have been very happy. Honestly, I don't use nav that much, but what I do like is the idrive screen for all the other stuff, the OBC, the radio, album art from my ipod, etc. For me this makes it worth it, makes the car feel more high end vs. just the regular stereo with LED dispaly.
TJ
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