I bought this because I needed a smaller sized filter for my bedroom. I’ve used Blueair Classics in my home for a couple of years. While I prefer the metal construction, sound of fan, and HEPA filters in those, I appreciate the features of this new filter. During the day I run it on auto and appreciate the sensor. At night I run it on night mode, which is quiet turns off the light. For the inexpensive cost of the unit and filter replacements I couldn’t ask for more!