In a household with three adult cats I was constantly cleaning the litter box.  With the Littermaid LM900 I need only empty or replace the waste container about twice a week.  The litter is kept clean and smoothed by the automatic raking action.  Odors are minimal since waste is stored in a closed container and the exposed litter is continually cleaned.  Make sure you only use premium, clumping litter.  That's the good news. Now for the not so good news.  The unit is noisy with a capital "N".  Don't plan on placing it near the living spaces in your home if you value your peace and quiet.  Waste frequently lodges between the teeth on the rake so I'm finding myself visually checking anytime I'm near the unit and using my scoop to clear the rake.  About every other day I need to use the scoop to scrape along the bottom of the pan to loosen anything sticking to the bottom so the rake can catch it on the next pass.  Lastly, the included ramp which is supposed to keep your cat from tracking litter is a joke.  It simply isn't big enough and my cats usually jump over it rather than walk down it.  To solve the problem, I continue to leave a small area rug in front of the unit.  That seems to catch about 75% of the tracked litter. the unit isn't cheap.  Taking into account the noise and the other problems, I would still buy the unit if I had to do it over again primarily for the conveninence.