Whether gull-wing, butterfly or scissor-wing style, car doors that open upward are showing signs of going mainstream. Sure, the 2011 Mercedes-Benz SLS sports car with upswinging doors costs close ...

There's nothing quite as cool as opening a vertical car door and stepping out, but is there a real difference between butterfly and scissor doors?

Using them was the biggest frustration of my time with the car. Functionality would be improved with pure manual operation for the scissor doors, or even conventional hinges.

The KLEEMANN Scissor Door system uses a unique two-axis hinge mechanism. A hydraulic station, containing a high-pressure pump and sophisticated control valve assembly, is located in the trunk.

As part of this effort, the P7 Wing Limited Edition has been equipped with Lambo-style scissor doors which are bound to turn heads.

Likely an attempt to show off, the impact bent the falcon wing doors backwards against the proper direction of its unique hinges.

There's nothing quite as cool as opening a vertical car door and stepping out, but is there a real difference between butterfly and scissor doors?