Some guy tried to pitch this to me in the elevator at the Riviera. When I asked him about things like damp cloth, heated tables and cue elevation angles, he really didn't seem to have any answer except "it works". Like to know if anyone with one of these gizmos really thinks that it is effective. As far as "study the angles before the game", I do that, only I call it practice.
The natural angle works in each to the above mentioned scenarios. If that were not the case players would not be trying to work it out with the diamonds. Medium stroke, center ball, and the ball follows the natural angle, so ya, it works. Thank you for providing me an opportunity to explain. It was difficult to go through it all in a 10 second elevator ride.