I haven’t been using this for long. It was easy to get it started right out of the box, which I appreciated. All I had to do was remove plastic from the filter. It runs quietly on the two settings that aren’t the highest but the sound when it’s on high isn’t bad at all. I like the way it looks, also. So far, though, I can’t tell if it’s really doing anything with my air quality. I wish there was a way to know. If I could tell for sure that something has changed I’d give it 5 stars. I just don’t know yet but hoping at some point to be able to tell, especially since I bought two!