This really is a very nice air purifier. The higher than usual price put me off at first, but since I have family members who suffer from allergies to ragweed and certain pollens, I decided to pull the plug anyway. I was particularly attracted to the size factor (slim for a 2 HEPA filter model) and the variety of options for controlling it.I've been using it for about a week now and it has made a difference in the air quality inside my home. I'm seeing fewer sniffles and red eyes, so it appears to have been a good investment. What I like most is the ways that I can control it. Besides manual controls, I can set a schedule for it to follow, or have it come on when I arrive home via a link to my bluetooth phone, or have it adjust itself based on the VOC inside the home; or the projected allergens in my zip code on any given day. I've finally settled on having it follow a schedule and base its operating speed on the allergen projections for the day. It is so effective that most of the time, it runs on the lowest speed, which is super quiet. Unless I am looking directly at it and see the blue lights on the control panel, I am not even aware that it is on.I like this enough that I am thinking of getting a second one for the bedroom.