We have 10 rescue cats in the house, so I was constantly searching for a better way to handle the endless litter detail. Cat Genie is it! We have two of the units and if you follow the directions they are hassle free. It will change your life. We also have three Litter Robots (my second choice in automatic litter boxes) for areas where the plumbing is not available and they are better than any of the other plumbing free litter boxes I have tried, but when we build our new house, we will be putting in enough plumbing to accommodate Cat Genies wherever needed - they are that good. It took some of the cats a bit to adjust to the granules, but don't give up - they will come around. Use the cat activation mode as recommended and use the maintenance cartridge as directed and you won't be disappointed. The supplies may seem expensive at first, but it is actually no more expensive - maybe even less, than the constant supply of premium clumping litter required for other litter units. Highly, highly recommended!