I have been using this for almost 2 weeks. Apparently for one cat you can use this for 20-30days without changing it. So far I really like it. There's almost no smell. I have been using expensive litter box enclosures that have trapped some smell but were such a mess and broke down. This is not covered and doesn't smell and is even kind of pretty to look at. It is really nice to press a button and the stool be hidden out of sight and the litter neatly packed down with the automatic rake. My cat took to this almost immediately. She likes to bury her business and some litter flings out of the box, but it is still cleaner than traditional litter. The flaw is that the stool has to be big enough for the rake to push to the hidden compartment, otherwise it gets past the rake and pushed in reverse and stuck there (photo 2).