I have 4 cats so finding any way to confine the litter box is always a plus.  They all share one box so it has to be changed every couple of days.  I can say when I'm really busy and it doesn't get changed as often as it should, this box does a great job of keeping the odor contained.  The only reason I gave it a 4 is bc the actual litter box on the inside that pulls out to get cleaned is very cheap material.  I suppose I could buy a more durable box to put inside, but so far it hasn't broke.  The assembly was very easy for someone with basic tools and no experience.  I would buy this product  again.