I've been using this air purifier for about a month now and I am so impressed with how it has been working. I took the filter out and noticed that it has already collected a lot of particulates that I didn't even know were in my air. Also, the machine is very quite and has multiple settings depending on how much air you would like to filter. I have noticed a notable improvement in the air quality of my upstairs, and would highly recommend to anyone looking for a quality air filter.