Ball machine is a great tool. It never gets sick, tired, bored, goofs around, or is studying for finals. Also, it's great for a coach or other player to pop in to show a player what they are doing wrong and how to correct it right in front of them, and you can also stand right behind your son/student reminding them of swing keys or footwork, etc. Love my portable ball machine.
Wilson Ad Staff, 3 BLX Six One and 3 Blade Tour, Team K-Swiss