Idea seems great but the truth is that the box still smells you still have to clean it out b/c your pet may urinate on the side. This item is very costly b/c I have to replace the tray every other week for my one cat instead of every 4 weeks. I tried to return the box within the 90 days but you get a customer service person who is suppose to send you an e-mail on how to return it (which I did not recieve)there is no follow through.