How often do you see people transfer the technique grooved by the serve trainer to the actual serve? When I swing that thing my motion is flawless, and when I replace it with the racquet it is still flawless. However, when trying to hit a typical serve with that motion, it is very good, but not flawless. The more I continue to adjust my timing to allow that motion to flow perfectly as it does with the trainer, the bigger it gets. I may be wrong, but it seemed like that is what made Roscoe Tanner's serve so successful. It just flowed like one working unit. Thanks for posting about that device, it has really helped me bust out of my serving slump.