don't think that there are any known problems with the 645Ci yet.. but as with any new cars, there will surely be little niggling faults with the car...
With that being said, I think that the current 6 series is a worthy successor to the last 6 series... can't wait to see what the new 630 will be like with the new inline 6 and all...
According to Top Gear, The 645 convertible has 110 electric motors running the roof to the headlights. That's at least 110 things that can go wrong in the future.
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