I qwn a Sarrels Blueridge longbow. I am real good friends with Bob (the bowyer) and when I ordered a second set of limbs, I told him I wanted them exactly like the first set so I would have a backup incase something happened while on a hunt. He called me one day and said "Come get your limbs - they are ready!".
I get to his shop and he shows me the limbs, and says "Look, I put carbon in them for you!".
I was almost mad, because I wanted identical to what I had, but realized he was just trying to do me a favor, so I did not say anything.
Those limbs, and my non-carbon limbs were .1# differnce in weight. They chronoed the exact same, felt the exact same, and hit in the same place on the target. The only difference I could note was that the carbon limbs had a tiny bit of a different sound.
While it may be true that the carbon adds some strength to the limb, this bow convinced me that there is not enough of a performance difference to justify spending extra money on carbon in a bow, and I doubt I will ever order one with carbon!
Bisch