I concur with Nautilus that carbon-fibre or composite paddles do require more care than normal wooden paddles. Although carbon-fibre has great strength for its weight, it has a tendency to snap and in my opinion, the primary advantage in using carbon fibre is largely due to its weight. I still remember that during Regatta last November, Kyo who was then racing in SPC colours broke a carbon-fibre paddle (won't name the brand) before the start of the race. Someone also previously mentioned that recent batches of a prominent brand had some issues and had to be returned (I verified independently with the distributor). You don't have to be a "superpowerful" paddler to break a carbon-fibre paddle. And yes, like everything else nowadays, a number of manufacturers produce these paddles in China.
Again like buying anything else, I highly recommend demo-ing the products available and forming your own conclusions. Most distributors are happy to loan some demo paddles for tryout. I have also prominently, and with little bias, listed them out in the paddle talk thread. Manufacturing/distributing paddles/lifevests isn't "easy" and I appreciate these guys for providing a wide array of choices we now have. If these guys aren't around, there's only one single choice: rowing with SDBA paddles and wearing pink lifevests.
Getting a carbon-fibre paddle isn't going to instantly turn you into a better paddler. But if you get one, know what you are paying for and what you are getting in return. You should, because it's your money.