You might not want to have to sift through more than 5GB of music with the M500's navigation joystick, but it did get the job done.

ENGADGET: Review of Motorola's 5GB M500 MP3 player

It's controlled by a joystick on the window armrest, giving the pilot a clear view of three large computer displays.

FORBES: Flying Eclipse's Pocket Jet

The single biggest problem is that, given all the joystick's fussiness, there isn't a physical "back" button in the console, a lesson BMW learned in revising the despised iDrive.

WSJ: 2013 Lexus GS350 Review: Loaded With Everything but Thrills | Rumble Seat by Dan Neil