smoother engine bearings
I specifically asked Dub Jett about ceramic bearings when I ordered my Bar Stock Jett 50 FIRE -
He said:" They are a waste of money."
Based on everything that I've emailed Dub Jett about, and a few phone conversations, I believe him.
If you read what he has to say on his website, you'll see that he does change his opinion - after firsthand experience and evidence shows that the change is good.
Example: Read the FAQ about AAC liners vs. ABC - Dub says that years ago, he would have agreed that ABC were better - now, he thinks that AAC are better, and goes on to explain why he changed his mind.
For now, he sees no benefit in ceramic bearings - if a person wants to pay more for the same performance, that is up to them.