I bought the PureZone 3-in-1 True HEPA Air Filter about a month ago and have been using it continuously since receiving it. So far it has been excellent for my home. It’s very quiet and very effective at eliminating unwanted odors, mostly neighbor’s chimney smoke smells. I especially like that it has a UV-C light in addition to the carbon filter and True HEPA filter to keep the air in my home as clean as possible. I have extreme environmental allergies, so this really helps lessen my symptoms and makes my daily life a lot easier.