I have a Werner 4 piece breakdown. I've used it for a couple seasons because my other paddle broke, and I didn't replace it for a while. It's a very solid paddle that isn't likely to break. I've broken 3 other paddles in 2 years, but I've never broke a Werner. I think it's made of fiber glass. If I remember right, it cost me about $170 with tax.
One thing to watch is the button area that links the pieces together. After a couple years of hard use, it can get slack which allows the the two pieces to move slightly while paddling.
I havn't used any carbon fiber paddles yet, but I think the fiberglass Werners are dependable and cost effective.