As far as BMWs go, especially ///M cars, the F8x appears to be incredibly well put together. The only real issues I've heard of are the crank hub (but if you don't tune the problem is almost nonexistent), and the oil cooler getting holes punched in it due to placement on the vehicle.
I've searched these forums quite a bit and besides those two issues, I don't see any repeat offending issues and certainly nothing major. These are confidence inspiring vehicles!!
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