My dog loves this! I fill it with treats or dry kibble. I left all of the inserts in and they add some challenge to the puzzle compared to taking them out. The clear part of the ball comes apart into two pieces, make sure you hear it click when screwing it on or they may come apart if the dog is rough with it. This happened to me the first time I used it. It is very noisy rolling around on hardwood floors but I don't mind. My dog likes to take it to her elevated bed and bounce it to get the food out quickly or she picks it up by the top hole and throws it or she steps on it and shoots it into the walls. It has held up well despite how rough she is with it. It has been really helpful to slow her down when eating and give her a challenge by putting her dinner kibble in it. Happy with this purchase.