I almost looked at a set of these for a Corvette C5 Z06. On that car it almost looks good as it has small doors with upswept curves at the rear of the door. I'm afraid this is the equivalent of putting a scissor door on a barn - ultimately pointless. I've seen some of these on an SN95 and Fox Mustang and thought they looked pretty stupid. It's a novelty for about 5 seconds. Because they also swing out as they swing up, they don't really have any great advantage over normal-opening doors.
I recently had the pleasure of observing them in action on a Murcielago and they do look good on that as it's exotic to start with but it's no easier to get in the car even though the shape of the car means the side windows lean in allowing the door to go straight up.
In short, one looks like a jet fighter with the canopy up, the other looks like a beetle with it's wings open.