If you do a little searching you will find quite a few carbon rods that have shattered and impaled shooters.
I only use polished steel rods. This is like asking who has the longest one. Lot's of BS out there. I've heard the stories of rods wearing out barrels. Most folks either don't shoot very many rounds through a barrel or clean them enough to wear out a barrel. I have shot many thousand rounds through a BR rifle, cleaning every 8-10 rounds. Cleaning and cleaning rods did not wear them out. Throat erosion eventually wore them out. I used to use and still use Deweys on my hunting rifles and polished heat treated Ivy rods on my BR barrels.