Active Aero: The good, the bad and the ugly!

[crostonian]

Just thought I'd start a discussion on active aero, ie moveable spoilers, flaps, wings etc. The prompt for this was following an F-Type Coupe on the motorway earlier today with it's rear wing deployed. It looked awful, from a distance it looked like a Chrysler Crossfire, ruining the looks of the car from the rear and showing no cohesion with the rest of the design, there's also no attempt to conceal the mechanism underneath.

So which in your opinion are the best examples and which are the worst?