Have had the BreatheSmart Flex for almost a week now. Very easy to set up, intuitive controls, and looks great! This purifier is near silent on level 1 one and quiet on level 2, Using this in a 300+sf master bedroom with cathedral ceiling. Leave it running 24 hrs on level one at night and level 2 during the day. The air quality has improved substantially! Dust in the air almost entirely gone and the air smells clean and fresh! Will be buying another Alen unit for our home’s first floor very soon!