My boyfriend and I suffer dearly from local pollen allergies. This purifier allows us to get a restful night's sleep. Without it we have trouble sleeping. We noticed the difference to breathe easily and cleaner air in our apartment immediately. When our first purifier stopped working after a month of receiving it, we were desperate to get the new purifier. Our new purifier is working great and the return was handled with ease. We will definitely be lifelong customers! Thank you.