I wouldn't honestly know... I must say, they are very rare in Holland. I have been to the importer in Holland a couple of times since its' release, and they never had one! I saw a C4S cabriolet last week near where I live, and it was the first one I saw that wasn't on a special occasion. It was atlas grey, and equipped with a hardtop... I fell in love instantly! And that is a big thing for someone who doesn't like 911 cabs generally!
-Joost-