I purchased the Scoopfree Litter box because I get super lazy and forget to scoop the box daily which in return leaves the house stinky. The Scoopfree litter box makes it easy for me and my cat because the odor is non existent and I only need to change the litter every 3-4 weeks. This is the best litter box ever, I even ended up buying another one for my mom and her cats, she said she would never go back to a regular litter box.