I have bought Filtrete filters for as long as I can remember (bought house in 1978). I tried a few others (bought a case from furnace installer, etc.). This time, I am buying the top of the line - found on-line (2400MPR). I see the soiled filters, and I want to breathe the cleanest air that I can. I always feel better when my new filter is in! [This review was collected as part of a promotion.]