This self-cleaning litter box is an absolute God-send in my opinion! My other half bought one himself a few weeks ago which is being used in the hall upstairs as, having 9 cats, were using so much of the regular non-clumping cat litter - about 5-6 large bags a week - it was getting ridiculous (not to mention messy despite having a hooded catlit box) that I decided to buy a second one of these for downstairs too. Honestly, I have never looked back. We have a multi-cat household and they have no trouble using this tray: it did take them a few moments to get used to it, some longer than others, so I sprinkled a very small amount of their existing cat litter (non clumping variety) into this one and that seemed to do the trick. Once one cat had used it, they all had a go!! I have to be honest and say the only one who was a bit reluctant was my Maine Coon as he is a very large boy, and I could do with the litter box being just a bit bigger for him - so perhaps the manufacturer should maybe think about designing one especially for Maine Coons/ larger cats - but that said, he is quite a nervous cat at the best of times, so anything new to him is always something to be treated with suspicion!I have absolutely no regrets buying this - it is just great to get up first thing in the morning and not have to clean out or smell the cat litter tray: of course when they first do their business in it, you get a slight whiff, but once the rake has raked it away into the covered box, that it is .. the smell is gone. The litter granules this tray uses are amazing - they just neutralise the smell of pee or cat poo and they seem to last longer than I imagined they would, and when you work it out price-wise against regular non-clumping litter, it is competitive when divided into monthly cost. And there is no tracking of cat litter outside the tray itself with this.I cannot rate this litter tray highly enough as it has made my life so much easier regarding litter tray cleaning, and the house now smells pleasant all of the time. My cats actually seem happier since these trays have been installed as well; could be because the litter box is always pristine "clean", ready for use and raked free of any cat poo when they want to use it! I would highly recommend this to anyone, especially if your cats are all indoor cats like mine. I wish I had bought one years ago!