My two cats love this machine sooooo much.....they just jump in and use it right away! I don't even have to put the old litter box right next to it. It makes my life easier and makes my house cat-free smell. It just makes a noise during cleaning especially at night after my cats used it but overall, I'm glad they invented this! I love the scent solution that comes with it too. Try to get one and for sure you'll cats will love this!