I have been using this litter box for 3 weeks with two cats and it’s been working out great. I kept their old litter box just in case they wouldn’t take it/one wasn’t enough but they barely went in it anymore so I got rid of it. I got a reusable tray and I buy the PetSafe litter that comes in two bags. I change it every 2 weeks (you’d probably have to once a month for one cat) and I scoop myself the solids under the cover every other day so it doesn’t smell at all. I love it so far, it has saved me so much time!