We'd always wanted to get an air filter, figuring that it would help with minor allergies and air quality issues... like the near constant wildfire smoke we're getting from California these days (We're in Denver, and luckily this year we've avoided wildfires so far). It seems to be helping with those. An unexpected bonus, however, has been that the surprise dog smell in the master bedroom that came with the house is entirely less noticeable since running the filter. I'm sure mileage varies, but my wife and I are pretty big fans of this little thing.