I've had many cats over the years, but the three I have now have adamantly REFUSED to use covered litter boxes. I've tried them all, to no avail. I was attracted to the Flip because of its looks - very sleek and modern - and it appeared to be roomy enough for even my largest Norwegian Forest cat (nicknamed Big Orange). It took a few days, but the youngest of the bunch started using the Flip box. Sure enough, within a week of having it, all three started using the Flip box. YAY! It's beautiful to look at and functional.