My two cats used them immediately!  My older cat is tall and long.  No problem using this Covered Hidden Litter Box. The Litter Box is attractive!  After turning the Litter Box opening to the side...No one knows they're Litter Boxes.Great picture of the product!  I purchased two.  The plastic palms are great. Really looks like a potted plant!. Easy to clean. No need to remove top each time!  After Litter Box top remains on for a day(or less)..goes on EASY! Great value, attractive, easy to clean....The cats immediately used the  Covered Hidden Litter Box !