This is my first air purifier and I am in love!  It has made a huge difference in my home in the short amount of time I have had it.  We have an inside dog and I always worry about how my home smells so this has alleviated my fear.  It runs quiet and has so many different functions other than purifying the air, from multi speeds, to cool or warm air,  plus different colors to determine air quality.  Such a great device!!!