Sunny loves his so much that he's been known to play with it at 3am. Cirrus used to play with it but hasn't lately. Sky also loves it and sometimes he'll play it with Sunny. Each cat will bat the ball back and forth to the other one. It's so cute. My RB Pepper used to love it too. Storm has never liked it. He just doesn't like to play with any toys that involve balls. Mine doesn't have the cardboard in the middle though.
Here's a pic of Cirrus playing with it.


Here's Sky playing with it.