I bought the ebook for $10. Nice job Brian. It makes sense to me, unlike some aiming systems. I really like the idea of using the diamonds to determine the angle, and thus the fractional hit. The difficult thing about using fractional aiming is accurately identifying the cut angle, and this system provides a concrete way of doing that. I haven't seen another system like it. Most aiming system focus on the balls "out in space" without reference to the table itself.
Unfortunately I just found the system for determining the cut angle to be too complex, with different zones and numbers that you need to memorize. It reminds me a little bit of some of the 3-rail kicking diamond systems, but there's more to memorize.
I look at it this way: It's possible to simply visualize the angle formed by the CB and OB lines. It's not as concrete or as accurate to do it that way, but I came away from reading the book not being sure it's worth it to learn this system for the little bit of an edge in concreteness and accuracy that you'd get over and above just visualizing the angle. I'd love to see this simplified, but maybe it's just not possible. And for people who want a really concrete system for determining the cut angle, and who are willing to put in some time memorizing the numbers, it's ideal.
Finally, I have a question: What is the correct angle line from CB to OB? Is it formed by the line going through the centers of both balls, or the line formed by the center of the cue ball to the center of the ghost ball after it is aimed to make the shot? I believe it's the latter, but it seems like the book uses the former.