We have used the Filtrete brand filters for the last 5 years now. I wondered if they were worth the extra price when I first saw them and now I know they are. We use the 1000, 1200 & 1600 depending on availability and we really do notice a difference. We have a small dog and grand-children who visit and they keep our house cleaner and we don't seem to see the colds / flu's. I think the cleaner air has alot to do with it.