We bought the Katzenoilette in size L. For our cats completely enough from the size in some cases even too big. The processing of Verrieglemechanismus on the sides could be better, because the turn you have to watch and keep the interlocks in mind that it does not open by itself. The right side of the litter box is not protected with a locking mechanism but is only held together by pressure when the toilet to the Kopft is rotated, can happen that comes that cat litter on the side without locking area out.
We expected more including, in particular for this high price. It's not just stable and the Processing up to scratch. At 4 cats we expected a relief and wanted, if you so "great" would buy 3. We can not recommend.