This product is like the air purifier for lazy people (read, me). I love it. I can always look over at the sensor and tell what the air quality in the room is and hear the unit working harder when the sensor isn't blue. We have 2 actually. One is in our son's playroom and one is in his bedroom. I know that I can just turn it on auto, walk away and not ever have to wonder if it's working because I can see and hear that it is. Amazing product!