At first I was hesitant,because of the initial cost! But now after 3 months I am so glad I did it and bought one! To aclamate my 2 cats, I put the washable granules in their clean litter box. They weren't too sure about the lighter material, but quickly learned not to flick it all over the bathroom. I then had to leave for the weekend, so I put the granules in the CatGenie and put a small amount of litter in they're normal litter box. I had been just starting the genie when they were sleeping, but set it on the half-hour delay comma and crossed my fingers they would use it. When their litter box was used, they then started using the genie. When I returned home in 4 days, I removed their litter box and just left the genie. I still have one cat that is skeptical and even though it seems he uses it when I am gone, when I am here he wants me to take him in to use it! I am loving the convenience, as I hate to clean the litter box!