My pigs love this hay feeder! It keeps their cage nice and clean, and holds tons of hay. It is heavy and well made and the pigs cannot tip it over or crawl inside. Very little of the hay is wasted because none of it gets soiled. One nice feature of this hay feeder is that it does not need to be mounted, so it is incredibly versatile. I can put it inside the cage for day-to-day use or outside the cage for playtime. I would definitely recommend this hay feeder to all guinea pig owners!