I had a Bionaire that I think did a much better job removing dust, allergens and pet dander but it had a paper filter that got very expensive to keep replacing. That is why we bought the Ionic Breeze. I do think it helps but maybe not as well as the one with the big paper filter. I can tell you this though, I had terrible allergies and after being tested I found out my biggest allergy was cat dander - figures. Anyway, I have been able to stop all meds for the past year and the cats sleep with me in the bed with no problems. I don't know if the Ionic Breeze which is in the bedroom is the reason but I do think it helps.

Hope that helps you.