Don't put this on a carpet!
This product was on track for a great review, until I decided to move it to another spot. That's when I discovered that the bottom of it isn't sealed in any way. You sprinkle the catnip on the top and it immediately falls out onto the surface beneath, turning the floor into a giant scratch pad, which is exactly what I was trying to avoid. Such a stupid design, and a shame because the cat loved it.