Just put in a 6 hour training session with my new predator 314 fat shaft. I used to use ob1 and I loved it but I always wanted to try the 314 fat shaft. I have noticed less spin on the cue ball but it is a great shaft. I bought it from seyberts.com. I prefer the feeling of the 13.2mm over 12.75. I definitely recommend it if you are thinking about getting one. 9baller