“I rarely post a 5-star rating, but this product exceeded my expectations. My objective was to improve my hand-eye coordination and tennis volleys. After 3 days of training, I noticed a significant improvement in the quality of my volleys. In fact, I was told that I had amazing reflexes by one of the opponents. The training is enjoyable, and addictive. Very good quality and value for the money. I know that I can make one for under $3, but it’s just not worth it. .”