We have several robot litter boxes. This one is by far the quietest one we have. You can hardly hear it! It comes with an odor cartridge for the waste drawer and it is very aesthetically pleasing. It so cute! We have 11 cats, with most being larger cats. Our 11 pound cat fits but there is not a ton of space. My only critique is that they make it in a bigger size for cats that are larger. Other than that we highly recommend it!