“These aren’t mere gullwing doors, though; they’re far more complex. Power actuated and lined with capacitive, inductive, and sonar sensors behind the aluminum skin to keep them from delivering an uppercut to your head or garage ceiling, the doors are hinged above the glass to automatically fold away from parked cars and obstacles. They’re probably the smartest doors ever fitted to a car. But do you want complicated doors? Mostly you just want doors to open easily, quickly, and provide a large-enough portal to let you into the cabin. Fully open, the Falcon Wing door provides a large entry, but it’s still easy to smack your head on the tip of the wing.
There’s a wait, too. The Falcon Wing doors take five and a half seconds to open -- six to close -- and occasionally the sensors halt their progress, even when there’s nothing in the way. For as smart as these doors are, it turns out that even semisentient doors with echolocation are pretty dumb. And yet, the dumbest part of the Model X is the first thing you will show off.” -- Car and Driver