After Katrina, my cat lived at my boyfriend's house for a month; he had an automatic litter box. My cat would do his business, jump out, watch the box clean itself, jump back in, mess up the litter, jump out and watch the box clean itself. He did that for the first week, then he got used to it. I think he was playing with it. You do have to change out the container fairly often, especially for two cats. You might have a problem making them share the same box, too.