Carbon 6 sells remage CF. Have heard good things about that brand, never used them. I would buy one if that was my only choice.
Any barrel nut barrel will perform pretty well like a shouldered barrel. Its at the extreme that a shouldered barrel will outform.
Most of the bad stuff I hear was from early gen CF when it was a learning process. Lots of stuff I hear is speculation about, blah blah blah. The process is pretty mature now.
One brand I do hear most complaints is Christiansen Arms. Not sure why.
CF gives you more stiffness for the weight. You can get the same results for the first three shots out of a similar weight pencil barrel. My Proof CF don't walk on me.
I only buy them for hunting rifles, otherwise I go steel.