This is the best self cleaning litter boxed I've tried (and I've tried a few!)! My cats started using it immediately and haven't used their old litter box since. I'm really impressed with the odor control this litter has, there is no lingering odors at all. It is very easy to exchange the litter trays and I haven't had any issues with the disposable trays leaking or anything since I've been using it. The crystal litter soaks up the urine and doesn't leave that awful ammonia smell! This is quite an impressive litter box all the way around. The trays last up to a couple weeks, depending on how many cats are using it. I highly recommend getting it! I have multiple cats and now that I know how great it is I will definitely be adding another one into my home! It is so nice not having to clean a litter box everyday!!!