 Owned many BMW products.  All great cars except for this one.  Car had repeated problems with navigation screen.  I was on my third screen.  The computer also reported many false positive problems that would mysteriously disappear and reappear.  Great car to drive.  Great performance.  Actually good gas mileage for high-performance 8-cylinder.  Unfortunately, I spent more time with my service manager than my family.  I traded the car in yesterday.  Took a bath on the trade. But was worth it. Ouch.  Good riddance.