I have to admit I was not the primary user of the product so this review was written by the birds that use it.
This product looks like a car tyre which means nothing to us because we are unaware what a “car” is but the human tells us he likes it which means he fills it with food which is good.
This product contains food which is good. It contains food which is high above where the cat is which is also good.
This product also allows us to eat and crap on the cat while it waits under us. Which is great.