I went to the vet with my cat Morty 3 weeks ago. I was told that he was overweight & that I should try to get a slow feeder for him & cut his food intake in almost a half. After searching through reviews I decided on this one. Morty went in for a check up today and he has already lost 1lb! He learned how to use the food tree quickly. (It's also a lot of fun watching him use it) The packaging also doubles as a toy! I'm a huge fan & completely recommend this slow feeder.