Awful!! Bought this for my bedroom. I was excited because of the UV germ cleaner. Ugh! Unlike other air purifiers, this has a fan that blows. It's not only very loud on the lowest setting (which the white noise wasn't an issue) but it kicks up all the allergens and blows them around the room. I had coughing fits in the middle of the night and had to use an inhaler for the first time of my life. My husband noticed that the fits didn't start until we started using this unit 2 months ago. We shut it off for the last 2 days- not more coughing fits in the middle of the night!