I have 3 cats.  I wanted to try this Scoopfree litter box to help keep the box clean. So my 4 and 5 yr old cats adapted will to this new litter and litter box.  My 12yr old cat was scared of it.  Could not get her to use it.  Just too big of a change for her I guess.  The new litter box worked great for my other two, but will be expensive buying the refil trays.  I feel this litterbox would be best for an elderly or disabled cat parent.  Since very easy to use and much less work.  The cost may be a bit more worth it to them for the convenience.  Our family has just decided not for us since my oldest cat won't use and had to keep the old litter box for her anyway.