The sieve function and slide out tray helps make managing pine litter much easier. The tray is also easy to clean and doesn’t trap odour like our old plastic litter box did. Only problem is the litter box cover curves too far inwards, meaning that my cat has to duck his head to cover his business. He kept bumping his head and getting frustrated so I’ve ended up having to take the top off altogether which, for a litter box of this cost, is quite frustrating.