The Table Tennis Robot is a handy little machine that is available in a few different versions. The one you see here is only an example. Check them all out through the following link:
This Table Tennis Robot here is the iPong Original Table Tennis Training Robot. No need for a partner to practice with. Set the direction, speed and many other settings. Read More About it or Buy it Here.
Many adjustable settings to work on exactly what you need extra practice with. No need for a partner. Good customer reviews.
Reading through the reviews on this exact product, the two main things that stood out were the fact that the balls are not included, and some people seemed to have some assembly issues. The iPong is not the only type of ball returning trainer robot available. You can check out this one and others through the links provided on this page.
This one is a bit more elaborate. This is the Newgy Robo Pong 540. Not only does this shoot ping pong balls at you, but you can also adjust both the speed of the ball, and the frequency at which they are come to you.
You can also control the topspin, backspin, left side spin, right side spin, and a combination spin. Simply place a bunch of ping pong balls into the tray and the robot will bring the balls up and out the shoot for continuous practice. Fairly simple to set up and take apart, and it will sit on top of the table.
See a lot more details about this one, or browse through many other similar types of Pong Pong practicing aids by clicking the image of this ping pong robot seen here. You will also be able to read through a variety of customer review comments that are insightful and help you make a sound buying decision.