"Great with Greenies treats!"
My younger cats love this toy, my older cat is motivated enough to sit around and wait for the younger cat to knock a few out, then steal them. All in all, it's hard to open without a flat head screwdriver, but that is the only flaw, it snaps back together easily, and holds up to 15ish treats, enough to fill, and roll across the floor to get the cats away from the door when I am leaving the house. Works best with HARD cat treats, such as feline greenies. They actually know the sound of it being filled now, and come and wait for me to put it down for them.