I bought this after my sister-in-law recommended that I buy a room purifier because of all the severe allergies that I have. She also has a hard time with her allergies as well as asthma, and she said that having one of these really changed her life. I tend to agree now even though it is only been a night with it, when I woke up my throat wasn't hurting and my nose wasn't stuffy, and I didn't have my usual round of sneezing in the morning like it's typical for me to have. Usually I'll get up in the morning and sneeze anywhere from 5 to even 30 times anf at that point I take all of my allergy medicines, and the eye drops, and the nasal spray, and still have to wait an hour to feel normal again. I didn't have any of those issues and I really feel like this has something to do with it because it's the only thing in my entire routine that changed. I love it!