This is my second DH Lifelabs air purifier - I have the large one too and I just love this product. I am a dog owner and highly allergic to pollen and the environment so having these air purifiers in key rooms in my house has greatly improved my symptoms when facing pet dander and pollen. Additionally I've noticed they help remove cooking smells from the air too which is amazing. Cooking bacon on a Saturday morning can stink up the house for 24 hours, but these purifiers sense the smoke in the air and immediatly start working overtime to help eliminate odors.