Cartier Roadster Chronograph

Im going to St.martin in a few days, im contemplating buying one of these down there, because the island is tax free and the watchs are usally at a lower price then anywhere in the states. What do you guys think, anyone got an idea on what kind of prices they have in the Caribbean on watchs ? Maybe some of our watch experts can comment.

I am not fimiliar with swiss watch movements, what do they exactly mean, someone told me the Cartier does not have that special of a movement like other watchs so, what would one mean when saying that.

Thanks, Sebastian