I have had the ScoopFree Classic Self-Cleaning Litter Box for about 2 now. It has been such a blessing as I now no longer have to manually scoop my cats' litter box. Assembly of the litter box was super easy, even though it came in instruction manuals. The litter box also comes with cat litter crystals. In addition, there is a plug in adapter for the litter box so you have to place it near an outlet. That's one of the only cons I can think of with the ScoopFree Classic Self-Cleaning Litter Box. Apart from that, I highly recommend the ScoopFree® Classic Self-Cleaning Litter Box.