We have 2 chinchillas, Gracie and Lily, who are on their 5th stack a fuzz. The fact that we get through them rapidly is certainly not an issue with quality and more to do with the fact that our girls love them SO much that sometimes they just have to eat them. As there are 2 levels, the girls can be cosy inside when it's cold and cool off on top when they get too hot. It also means that they can have some 'alone time' when they get sick of the sight of one another!