I have 6 cats and only 2 of them use the CatGenie. Even so, it does help as I used to have to scoop my litter multiple times a day. I've had the machine for over a year now, I've had one issue where the plug would over heat (soon after I started using it) but I was sent a new piece after contacting the company and have never had an issue since. It's also a good idea to take it apart to give it a good clean, on top of the maintenance cartridges as there can be a lot of build up.
I'm happy with this product and there's nothing on the market quite like it.