Cleaner air means less runny noses to wipe.
My son is allergic to dust and pollen and grass and trees and everything else that grows or moves. He's had a perpetually runny nose for over a year now-- and I spend more on Kleenex and Flonase than I do on clothes for him.
The Therapure 100 Air purifier is small and compact (not one of those units that takes up more space than your fridge)-- but even after using it for a week, I've noticed a dramatic difference in my son's runny nose. It's portable, too! I can bring it over to my mom's house when he's going to stay the night and I don't have to worry about him coughing and wheezing all night.