I was afraid for my cat that does not know to use it, but eventually he found his feet after a few weeks, I am very satisfied because my cat no longer wake up at 5 am to ask his kibble .It does not grow a muscle and regulates all seule.Concernant behavior I have not found différence.Le only negative of the product is that the kibble crumbs remained on the floor if your cat not eat and sticks under the feet when we walk proximité.Cela is due to the great brand kibble purchased in specialized commerce.Avec croquettes there are no more worries.