I have to agree with what Arthur and Frank think about weight of the 2315s compared to weight of "most" carbons. I switched to carbons simply because I wanted to try them, and so far I have been satisfied. But my favorite arrow over the years was the 2216.......and I am seriously considering the Terminator Selects or going back to XX78 2216s if I don't play around with the lighter Axis arrows.
My biggest gripe with most carbons is the lack of more options in finding heavier carbons for hunting.