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 angles will still work under these conditions and if they didn't you wouldn't be calculating them in your head. Its all math and on a single rail, center ball, medium speed stroke the ball will follow the natural angle.