Thanks to all who replied.
I'm interested in learning this system, but If I don't trust the instrument giving me the slope, then I'd have a problem moving to the next step.
I've always said " I wish you could take a lesson to learn how to read a green". When I read about Aimpoint, I thought it was too good to be true.
Using spirit levels , builders levels and lasers my whole life, I know that a nine inch level would never be trust worthy, to build any thing with any kind of accuracy . That's why I'm skeptical about using one to find slope. I could place a nine inch level on a floor and it could read level, then move it a foot away, and that spot could be out of level.
I'm going to see if I can find any info on the web showing how the level is used in finding the slope. I'm supposed to attend a clinic Nov. 8 so I hope I can find some info soon.
Sorry for being a skeptic, old habits die hard. Maybe if I see how the level was being used, I'd be able to jump right in !