Teaching
This topic sort of bugs me. Sorry no offense but teaching really is an art. It is about getting someone to understand what you are putting out there as an instructor. Try it some time it is really not alll that easy. Want lessons from the best take a lesson from Efren Reyes, (which I am pretty sure he won't do), see if you get anything out of that! He says he cannot explain "what he do he just do it". I have copies of books "written" by Willie Mosconi, well, of course it was written by a ghost writer. We all know he was not a teacher and probably would not have been a good one. However, just having his name on the book probably sold exponentionally more copies than without.
I have a friend that spent a fair amount of money to go see Allison Fisher. She did really well with him. Explained where he was failing and helped him to see why that was affecting his game. "Geez", he said it was pretty much everything I told him and I am just and APA 7. What did he learn? Fundementals, fundementals, but more importantly why the fundementals are important, probably something I cannot teach.
Here is my take. Spend your money on an hour or two and see if what this person is telling you makes any sense. It is probablay way cheaper than your next pool stick, and certainly way cheaper than the amount of time that you will be spending stuck at a certain level with your game.
Slurp Slurp...... Martini Heaven
Sincereley Good Luck With Your Game