I just think you have to have control learned to a certain level before the LD shafts have real benefits.
Some of my reasoning behind this is due to me teaching my oldest son, who is 16 right now, how to shoot pool. I want him to learn center ball control and have a certain proficiency level before I introduce him to using english and then become proficient with cue ball control utilizing english. If I had him using an LD shaft right now I'd be concerned with him not using true center ball control since LD shafts would allow him to use a tip or two of right or left english w/o any consequences in a lot of his shots, therefore it might allow him to become lazy with not hitting true center ball shots. Do you understand what I'm getting at? The ball reactions don't lie on shots. I want him to fully understand the consequences of hitting away from center ball and how it affects cue ball control, especially when you have the cue ball coming off of a rail after a shot.
My son is almost to the point where I want to teach him english and I will be getting him an LD shaft for his cue probably after the State youth tournaments he will be playing in April. Then I have a whole lot of time to try and teach him the finer points of english, how and when/why to use it and then I want him to shoot shots with both his original shaft as well as the LD shaft I'll be getting him so he can fully understand the difference.
I hope I'm approaching this the right way, especially since he's my son and of course I want him to be successful and good at shooting pool and enjoy it as much as I do.
Any thoughts from you professional teachers/instructors out there?