i would do plenty of research before getting any of these. you dont want to find out in 20 years you made a grave mistake.
oh, i have my own doubts about carbon fiber rubbing my hands for hours on a day. yet then having some coating that isnt clear exactly what is in it put on that will certainly rub off to some degree on you.
and what is with them not taking the shaft back and thinking putting a coating on it takes care of a failing product.
should have sent him a new shaft.