It looks like it would be a good toy but my kitties already play with balls and bat them back and forth to me so the first thing they wanted to do was take them out of the box and they did and they are gone - one never to be seen again. There is no incentive for them to keep playing with the balls in the box even with treats.
I bought the larger one, since I have adult cats. I opened it last night, as soon as I got it. The cats waited an hour or so after I put the Peek-A-Prize down on the floor, but soon I discovered my 9-year old cat playing the "hunter game." Then this morning, I saw the 5 year old cat getting into the act herself. I'm guessing that soon my 2-year old male will discover it for himself. The oldest female (15-1/2 years old) gives it a wide berth and couldn't be bothered. In any case, this is one toy that is a real hit. Most of the other toys I've bought before have been ignored.
I was hoping that my cats would enjoy this on their own however it works best if I play with them by pulling a string or another toy through it to tempt them. My cat who enjoys treats did work hard at retrieving it and was mentally stimulated - he also loves balls but was not interested in them in this 'toy'. My other cat who loves feathers was also not interested when they were inside this 'toy'. it's a good idea and possible that other cats may get enjoyment out of it.
It was cheap thrills entertainment for an active cat that doesn't like toys.
My cat loves this. We put toys and treats and he has a blast getting them out. He's figured it out quickly, but it doesn't bore him. Great toy for keeping your smart cat stimulated. I knew my cat would like it, because he likes to build little puzzles for himself by sticking a toy in a narrow place and then trying to get it out. If your cat is playful and curious (and likes treats), he/she will enjoy this. It is a sturdy, well-made, nice looking wood toy.