This product is very good & large, but the door broke at our first attempt of fastening it to the box
Our kitten had grown very large very fast and we needed to buy a big litter box that would fit his size 1 year from now. He is a Siberian male and currently weights 5.6 kg.
We bought two of these, one gray and one pink. They were really easy to assemble, but one of the doors broke immediately when we tried to put it on.
Our cat adapted very quickly to the new toilets, previously we had two toilets without a roof or hatch. I suggest that you let yours take time and get introduced.