BMW is credited with offering the leading user interface (iDrive), according to "The Automotive HMI Report 2013" published by Telematics Update earlier this year.
The height and width of the control display are neither too great (like that of Tesla's) nor too small.
The display looks simple and clean. As BMW points out, "the menu navigation follows the standard method used in computing and can thus be used intuitively."
Meanwhile, iDrive's controller offers a rotate-and-press mechanism that enables intuitive, one-handed operation. Right means "continue." Left means "back." Turning the button allows the user to scroll through a list; pressing it selects an option.