Although it initially felt a little rickety, this litter box has seen heavy use (my orange cat's favorite) for over 6 months and it's still functioning well. We use it with crystal litter and haven't had issues with odor or litter longevity despite not having extra "breathability".  When my cat is scared, he even hides in here. He's big, too, about 12lbs.  Bought it for the aesthetics, but it's just great for our small space.