I have been using my air purifiers for over a month now. I love them! They are attractive in my rooms, and quiet. I have noticed a big improvement in the "fresh" smell in my rooms and my nasal congestion has all but dissapeared. I have 3 Golden Retrievers and they produce a lot of dander. Though I vacuum daily, it still builds up. The great thing about the filters on these is the outermost layer of them is pretty strong and I vacuum them to and dust comes right off. I only do that in hopes of the filter lasting longer as they are still a bit expensive. I will recommend these to everyone!