When it works, it's great! When it doesn't, well.......
As long as you don't mind spending [price] to replace the unit every 6 months or so, the Littermaid self-cleaning litter box is wonderful. I have 5 indoor cats. For about 6 months the product is a God-send. Especially if you use the premium scoopable litter. Nice smell and clumps in a way that the box "likes". The obvious down-side is that LitterMaid hasn't quite figured out how to create a product that works well for any length of time. Some day, somebody will invent a similar product that really works. Don't ever try to deal with LitterMaid's customer service.