Hmmmm.... I shot XX75 2315's for years with an old PSE round wheel dual cam. Now that I bought a new Reflex Highlander, I went carbon (Beman ICS Hunter 340's). After seeing the difference between carbon and aluminum, I wonder why it took me so long to make that "grand leap of faith" to carbon!
Once you go "black" you never go back.... Carbon rules! It's either straight/shootable or it's not.