I have tried most of the carbon fiber shafts including the Cuetec Cynergy, McDermott Defy, Mezz Ignite, etc, but they are very expensive & you usually in most if not all cases are getting just a shaft for $400-600 which is crazy. With JFlowers Cues, you can get a full set up with a carbon fiber shaft & a maple butt for $319, it's the JF10-11WF. Check it out at:
https://jflowerscues.com/product/jf10-11wf/.
I played with a Konlin CF shaft which is the same as the JFlowers build, the shaft is not LD at all. During my tests it totally missed a ball on the far side of the table when using spin, same as a house cue. Even a mild LD shaft was able to hit the ball about 1/4 full, and the Revo and a few others hit the ball almost full on. Standard shafts (house cues, the Konlin/JFlowers CF, Joss/McDermott/Lucasi maple, end up hitting about the grey ball. Higher level of LD shafts like Revo, Z3, OB Carbon, Mezz Ignite hit about the orange, almost full on. The less than top LD shafts, 314, OB wood shafts like OB1/2 or Phoenix, other CF shafts like Cuetec, Meucci, Jacoby, were around the green. This of course does not mean that the less LD the shaft has the better a given person will play with it, I think the reason the Cuetec and other shafts are popular is exactly because they don't react or have a hit feel like a super LD carbon fiber shaft, they are closer to a wood LD shaft so people feel more comfortable with them.
