I have had a Catgenie for three years now, and it is still going strong. I recently adopted 2 more cats, bringing me up to 4 cats and so have ordered a second Catgenie so that there will always be an open and clean place for my cats to do there business. My husband and I debated whether it was necessary or not, but after factoring in the costs of our original and all the supplies we have used in the last three years and seeing that it came to about $20 a month, we felt it was a sound investment. There is never cat odor in our house, we don't have to mess with cleaning (and the disposal of used) litter, and we simply felt that it was a no brainer. I highly recommend the Catgenie to anyone on the fence about getting it.