So far, so good. In fact, I liked the unit so much I purchased a second for the bedroom. On auto mode it will go from whisper soft to cranking up if it senses anything in the air, even smoke from cooking or spraying air freshener. Looks modern and unobtrusive, like a large Alexa unit. Have had the two for about three weeks but am enjoying them so far. I also signed up for the filter service, so in 6 mo will get replacement filters.