I have three cats and decided to try this automatic litter box.  I have one young cat and two older ones.  The younger one watched me put it together and set it up.  She was quite intrigued by the raking motion.  She immediately used it upon final set up.  Then laid there and waited for the raking to begin.  When the raking finished she jumped in again and then jumped out.  Then she laid there to wait for the raking to begin again.  I also bought one for the upstairs and have had no problems with that one either.  I am looking forward to less mess and smell.  I can see and smell the difference already.