randzz 
2012 BMW 6 Series Convertible 640i 2dr Convertible (3.0L 6cyl Turbo 8A)
Disappointing
 My 640I was the worst car I ever owned. The computer system went out causing the vehicle to malfunction. They replaced it. The windows would not go up in the rain. They tried to fix it but continued to be a problem. The navigation system is the worst. I got tired of all the problems and traded it in at 7000 miles. While driving it to the Chevy dealership to trade it in the computer system went blank and 1 at a time all the systems went black. Absolutely the worst car I have ever owned.