Poor quality compared with earlier versions
We have had the smaller model for several years, and had no issues with it. We now have some big breed cats, and bought three of the large size, to replace our other large litter trays, as we wanted lids and doors. As I unpacked the first one I noticed the plastic is much flimsier than our older tray. Then I put the lid on. It was a struggle to get it on properly, and a struggle to lift it off again. I tried using the locks. They do not move smoothly, and on inspection I could see that the pan has small tags of plastic in the holes they fit in, that should have been removed. I have now taken all the locks off. All in all, I am not impressed with the quality of these trays, and will not be buying any more. Oh, and it took the cats just a couple of minutes to be up on the lids, tearing out the filters. I am still working on that problem, as without the filters the lids have gaping holes in them