We have had our CatGenie for over a year. The CatGenie is always clean for our picky cat, even when she has to share it with her rather pigggy brother. We use the added side walls that come with the kit, but the GenieDome was too cozy for our big cat. Side walls work fine without the dome. The litter does track out, but less than regular litter did. Still easier to grab the dust buster than a scoop. I was worried about the cost of Cartridges versus litter but it has turned out to be about the same or less then conventional litter and deodorizers and our small house smells so much better with out the lingering cat box odors. We are purchasing a second CatGenie for an elderly friend of ours who is no longer comfortable hauling boxes of litter from car to the house and has balance issues when bending over to scoop. We set our to trigger by the cats, but with a time out at night so it does not wake us up.