I bought this product to help with allergens and the overall musty smell we get upstairs from an old air conditioning system in our duplex. I've been using it for about a month now, and I can definitely tell a difference in the smell. My kids haven't had as many allergy symptoms when inside since it's been on either. You can tell the VOC detector is doing its job (when in auto mode), because if I spray Lysol or Febreze near the unit, a few seconds later the color changes and the fan speeds up. I would definitely buy this product again, and I plan to get another one for downstairs.