I like this air purifier very much. No secondary filters to be frequently changed,just one heavy disposable filter that lasts over a year. We have five dogs, seven cats, and live near a dusty cotton field. The Bemis has been a whiz at keeping our family room air fresh and it has eliminated the need for daily vacuuming. (Not that I EVER vacuumed every day, but I needed to.) Mine has run on the medium setting 24/7 since last summer. Turned it off once and was again inundated with disgusting fur/dust/what-have-you. This workhorse has made my housekeeping more efficient without my exerting yourself-

This is definately a quality air purifier. IT definately makes the air cleaner, making the whole room more comfortable and the air easier to breathe. It is rather noisy, even compared to some other purifiers, however.