The Butterfly Amicus Professional is a great table tennis robot that will without a doubt make you a better player.
The iPong V300 is the best table tennis robot under $200 you can purchase today. It can produce both backspin and topspin, it is incredibly practical and easy to use and it comes with a wireless remote.
The Newgy Robo-Pong 2050+ is a great digital table tennis robot that offers a lot of features for its price. The digital part means that it can be programmed to do exactly what you want, making it a valuable practice partner.