We're sightly air quality obsessed after West coast fires last year. Our indoor air sensor tells me that this is super effective in the bedroom it's in (we've got high quality, much more specific sensor). It works with the sightly oversized other BlueAir filters we have in every room making our indoor air quality significantly better than outdoor air. This one is a lot quieter than the bigger 121 units we have elsewhere. I REALLY wish there was a way to turn off the air quality indicator on any fan speed. I don't care about it being loud when I'm sleeping, I want it to be able to run at any speed without functioning at a bright night light! I've got post-its covering the light. The auto dimming was one of the major reasons I wanted this.