I had many issues with the design of the Zonda, such as the nose being too low, the rear too boxy and unrefined, and the mirrors being in a, frankly, stupid position.
All of those problems disappeared with the Huayra- it's one of those cars that I was stunned when I first saw it. The Zonda had become beautiful.
This is probably the most interesting car on the road. Firstly, the interior, which Richard Hammond describes as a Victorian's idea of the 23rd century. Secondly, the gullwing doors. Thirdly, the flaps that give the car downforce that depends on how hard it's turning. Finally, the Pagani company itself- it has less than 60 employees. Pagani is what Ferrari and Lamborghini used to be- one man's dream.
THAT is why the Huayra is cool.