We've got it and no one else does. Pneumatic ball machines use air pressure versus wheels to propel the ball. If you have access to a court with electricity, the choice is clear. Pneumatic machines have fewer moving parts resulting in less breakage and downtime. Without costly electronic components, air machines are the least expensive on the market.
Pneumatic machines provide unbeatable portability.
Try lugging a 55 pound machine up steps and out of your car's trunk without damaging its already fragile interior, not to mention your back. Wheels eject the balls differently every time, creating inconsistent ball patterns, while regulated air pressure assures consistent ball placement. Wheels machines shoot a ball out of a black hole - there are no audio or visual cues.