I love the concept of this ball. Maybe it would work better if you start off using this immediately with a kitten, but with our cats, being old and set in their ways, they wouldn't touch the ball. I am not giving it low stars because of that, I am giving it less stars because it really needs to have an option for even smaller holes than it does. There are two sizes of holes in the ball, one is very large, it could probably be used for dog kibble the holes are so big. The other holes, while smaller, are still so large that tons of food falls out with even the slightest roll of the ball. There was food EVERYWHERE when we tried to show the cats how to work the ball. I guess if your cat is starving, they will eventually clean up all the food on the floor, but until then, you have to hope you don't step in the food and crush bits into your carpeting. I also found it really difficult to open the ball, even after properly unlocking the side. I really thought I was going to break the ball trying to open it. It was also difficult to close up the holes or change the sizes. I suppose this is to prevent the holes from being closed while the ball is rolling around, but there has to be a way for them to fix the difficulty of operation. For our household, where our 8 year old son is responsible for feeding the cats, it would make it really hard for him to open and fill the ball. I could see it also being an issue for older people, too, or for someone with arthritis. Maybe we just got a bad ball...? In short, great concept, but needs a little work on design.