This is the 3rd one I have in my house.
This is the 3rd one I bought. I have 3 now. My home is 3500 sq ft and I have several cats. One is over 15 lbs and doesn't like the smaller openings on the other two. This one has a very large opening and I'm sure she will use it. These are quiet and efficient. I would have given it 5 stars except it did not have the pack of cat litter it said it comes with so I had to run out and get more before I could let them use it. FedEx delivered it to the wrong house about 1/4 of a mile from mine.