Very impressed
I've never seen our cat play with something as long as he plays with this treat ball - well, he plays until he's determined that no food remains anyway, haha.
Not sure how much exercise he gets but it certainly keeps him from inhaling his food in one go (which can't be good for him) and I'm sure it provides some amount of entertainment for him.
The ball itself is sturdy enough, and it has a clever mechanism through which you can adjust the size of the holes to suit the size of the food.