Originally Posted by maggmaster
It is basically a Practice Hit. They are not too bad for grooving strokes or changing a bad behavior. I used one to redo my backhand, couple hundred hits a day for a few weeks makes a pretty big difference.
I have found the Practice Hit very useful for beginner's stroke development and even more valuable in working out movement to the ball and proper spacing. Once the feel of these are dialed in it translates very easily to real time speed the court. This one looks even better IMO.