These sifting liners are a great way to keep a litterbox clean and maintained. For cats that scratch and dig deep into their litter, they may not work as well, as the liner sheets can get torn up by kitty claws. Our cats, however, are quite compatible with these liners, and my wife swears by them. It is a very efficient way to daily maintain a litterbox, and is far better than scooping in most instances. I can think of a few design improvements, however, such as nice, strong pick-up loops around the circumference of each liner sheet to make lifting and sifting even easier. Also, since the sheets are flat, placing a new set in an empty litterbox (especially deep ones) means the stack of sifting sheets will ruffle up around the sides of the pan, making it tricky to fasten everything securely with the included rubber band. A sifting liner design that incorporates a sort of "box-shape bottom" pre-formed into the stack might be a helpful update.