I've been wanting to get kittens in my house, but fearing for my wife's allergies and the smell of kitty litter I was put off. I began doing research on how air purifiers and this one caught my attention. After convincing the wife to let me get two little kitties, I put this machine into action. I am more than pleased with the results! The house smells amazing even with the kitty litter and my wife's allergies are next to nothing to her happiness. I also tested by bring family members by to test it, and all are shocked of how clean the air is with the two little kitties. The HEPA filter is awesome and automatic mode works great. When it is night it goes into silent mode to reduce usage. Overall, I'm very happy with this unit and the fact that I get to keep my kitties. I would like to buy one for my upstairs room in the future. So +1 for this unit for letting me keep kitties!