"I bought this for my upstairs bedroom, since I didn't have room for the type of freestanding scratching posts my two cats love downstairs. Unfortunately, since it only hangs on the doorknob, it doesn't stay still when they try to scratch. The older cat ignored it after figuring this out, but the younger cat liked to go bat at it and thump it around on the door. At 3am. In my bedroom. Needless to say, this scratcher went in the TRASH."