I have a proof CF pre fit, and I had a BSF CF AR10- .308 barrel. They both shoot/shot very well. The only difference I have noticed is that my barrel on the 6.5cm didn't seem to like the +140 gr bullets. With all my other barrels for bolt guns, they were spun up from a blank, so they were chambered based on what I intended to shoot in them. That isn't a CF thing, more of a pre fit thing. Not sure if the CF rigidity plays a role in the bullet weight shooting ability or what.... The proof shoots 130gr extremely well and is a ton lighter than my SS barrels.
For my next long term barrel (meaning for a caliber that won't burn it up too terribly fast), I'm looking hard at the Bartlein CF or at least a proof blank that I can have spun up. CF barrels are a lot less rigid so I assume the harmonics is a factor, but I've not seen anyone complain about any accuracy or other issues in a long time with CF barrels, they pretty well have them figured out.