I brought my fully operational BMW M3 to car max to consider trading it for another car. When they gave my car back to me the warning lights where flashing indicating a problem with the convertible top. They said they opened it and closed it fine but then the lights started flashing. They told be to bring it back when the had a tech on duty and when I did and He couldn't fix it. They said I should take it to BMW and they would not pay. To add to the miserable experience they offered me $10, 000 below blue book. read full review »