Turned the horizontal oscillation on at the indoor courts and loved it. Going to buy one. Wife making me wait a few days.... Even found an awesome one that isn't advertised and only sold directly from the company that is a few hundred cheaper for what it does. And really having trouble doing much exercise outside of playing tennis. Don't feel like spending hours a week running. But a ball machine with horizontal oscillation could run me for hours a week. Easier to run that way, plus playing real tennis.