EZworkout Tennis Training Rebounder Ball Stable Power Base Solo Practice Game with Elastic Cord

Not sure if this thing works as described. Got it in time, but after hitting a few, understood that the ball drags the base holder all the way making it impossible to practice. I am not sure what I need to do to keep it firm. Two stars so far just because my 4.5 years old enjoys it. We found out a new purpose to it: I will toss the ball to him, holding the cord on one side and then he hits the ball and I drag the ball back. Actually I bought this thing for myself so I could hit when no one is around.......

I used this product to practice tennis without going to the courts and I've had it for not even a week and the bunji cords already broke on the tennis ball I'd you get this dont actually practice with it like you'd play in a game. Just soft hit or maybe by another a different version of this. Wouldn't recommend buying this though.