The 6-series may have its problems, mostly in the design of its posterior, but it's still a BMW, and benefits from exceptional technology under the hood and in its chassis.
BMW's 6-series became legendary when launched in the late 1970s, and acquired the appellation "shark" for its body style. BMW's revival of the 6-series lacks the styling of the original, but modern BMW driving characteristics are excellent.
The worst design element of the 650i is the trunk lid. Lacking the nice slant of the original 6-series, the rear of the 650i rises up, forming a vestigial spoiler, while rounded rear fenders seem out of place.
The head up display is an optional feature in the 650i Convertible. It shows the car's speed projected on the windshield, and route guidance information when a destination has been set with the navigation system.