I've been shooting carbons (CX-hunters) for about 3 years.
I was also talked into trying them by a proshop I trust when I bought a new bow and the aluminums I had weren't the right spine for it.

They do seem to be more durable, and about 10 fps faster than alums with my setup, but I'm not sure the cost outweighs the reasons I like the alloy shafts.
I'm going back to aluminums (Easton 2315 XX75's or XX78's) before Fall for several reasons (in no particular order).

(1) They are cheaper, and just as straight.

(2) I can do all the assembly and repair work myself without an expensive high-speed saw.

(3) I want to be able to recover my arrows after shooting at a 3-D target without swearing in front of the kids.
(No I'm not going to pay extra for a bottle of lube and then still have to wrestle them out using a pulling tool).

(4) They seem to be quieter during the draw. The texture on carbons seems to make a bit more noise on the rest.

(5) I like the larger outside diameter so I can make use of a 5" helical fletching and still get clearance.
This is important to me since I release with my fingers and am therefore limited in my choice of rests.

That said, it's a personal decision , and I don't fault anybody for using carbons.
I just like the aluminums for me.