I finally gave in and bought one. Just came home and waiting for me to assemble it. I have been holding out not buying it because it seems too expensive for what it really cost to make. But then again it costs less the two private lessons for my son. I need this for my son and daughter to practice and it free me up to focus on watching there techniques. I can also use this hit to demonstrate the techniques to my kids.
i don't think this (or any similar ball feeder) will help you get better any more than playing with someone else. ball always comes to you in the same spot, same speed, no spin, just basically a dead ball.
The guy is too right-hand dominant on his two-hander but the woman has topspin, just not excessive spin. Some people need to decrease spin to get the ball deep.