We've had our CatGenie for over 6 months now and I don't know what we ever did without it! It was relatively easy to install. We purchased the complete kit with the dome. At first we didn't use it because our older cat had difficulty getting in and out of it. She recently passed away and our younger cat has no problem getting in and out. It's easy to use, easy to change cartridges and add granules. for the most part it cleans quietly, we occasionally notice it running a cycle, but only if we are in the next room. We had the littermaid and scoop free systems before and they are so messy and gross to clean and maintain. I don't know how we ever lived without the CatGenie and I'd recommend it to anyone that has a cat!