Review (2/5): Interesting idea, poor execution
Of my three cats, two are very much into catnip and the third could care less. So I was interested to see how these self grooming things would work with a catnip charge.
I opened them up, poured in the enclosed catnip and and put them out near the cat toys. It only took a few seconds for the first cat to show up. She sniffed it for about 2 seconds and wandered away. The other cats ignored them for an hour. I tried approaching them with it and they were again curious but didn't seem to like the way these felt.
They product itself is fairly hard plastic with no give. Cats sometimes enjoy rubbing up against such things but not this time. They actively avoided these, even when I just carried one over to a sitting cat and tried to brush them with it.
So three cats, zero likes on this product.