Great for a VERY small space. It works exactly as intended to, it's just very small and not very powerful. On the highest setting you can just barely feel a stream of purified air coming through the top. It's very quiet on the lowest setting and fairly quiet on the middle setting. The highest setting produces a good amount of white noise. The HEPA filter is easy to access for cleaning. I'm not sure if they sell replacement filters. It fits in a cupholder and would be good for a vehicle or a room that is about as large as a closet. I have no complaints about it, I think it's fine for a super small space