The only criticism I have of his kicking videos is that he doesn't provide much explanation of the reasoning or mechanism behind his recommendations. It's mostly just "if you want the ball to go there, aim here." I prefer more of the theory behind why - for example, "aiming through the rail to the diamond behind the rail is an adjustment for the fact that a rolling cue ball will bend forward of the perfect geometrical line due to follow," or something to that effect. Knowing WHY something works is important for internalizing it, IMO, and it convinces me that it's actually a correct approach instead of just something someone said once.
But other than that criticism, it's good stuff.
And he just recently posted a 4+ hour video to YouTube. Check it out if you're not sure about buying his stuff.