I've went through several different air purifiers and they just didn't work. I have this a try and absolutely love it. I love the display and touch options to show each filter percentage and so. The circle changes colors to what your air quality is which is great. I can tell a big difference in my air quality in the house now and it covers all of my house just fine. Was so easy to install the great filters that came with it. My family who come to visit says they can tell a good difference to and want one now