My husband fought me on this purchase due to the price. But after moving into our new house with forced air heating (previously radiator) and constant asthma/allergy issues every morning he agreed to give it a shot. It's been 8 weeks now and I can safely say the difference is stunning. I put my inhaler away and stopped my nightly allergy pills. I feel great and my whole family has had similar results. I literally bought an air filter for each bedroom and level of my home. My parents also bought one after seeing the difference it made for us. Very much worth it.