they hate it [SEP] i really really thought that my cats would go right for these but they have not used them one single time they are always rubbing their faces against anything and everything so i thought hey let me make that a more pleasant experience get something meant for thatrather than having them go crazy on a cardboard box or my toenails but nah it is almost as if they are afraid of it if your cat has used these self cleaning brushes before then they will probably love this mine are just so picky