I bought this litter box with best intensions, even after I read the negative comments about it. Unfortunately, I experienced the same problems that other users are sharing here.First of all, the cartrige could not last more than 8 days and this was only if I removed solid waste on a daily babsis. Just to clarify, I have one cat in good health standing. I do not want to imagine how the area was going to smell if I did not scoop the waste and even the wet crystals on a daily basis.Second, I used the box for 4 months only (and then gladly threw it away) but during that time I had 3 leak accidents. As a result,I am still paying good money on products that eliminate cat urine from ceramic tiles and hope to get the smell removed some day.Third, it is very very expensive and based on the experice I shared above, I would not get this box even if someone were to offer it for free.