My husband has allergies and asthma. Immediately after purchasing this air purifier, his breathing improved. He went from nightly asthma attacks to none. As other reviewers have mentioned, the quality sensor appears to be effective as well.

Even without allergies, the air is noticeably purer in our house. We have a large, ~1700 square foot downstairs and this purifier handles it well.

The device is mostly quiet and unobtrusive. Although it is large, it doesn't get in our way, and I don't feel like it creates noise pollution.

Given its effectiveness, range, and cost, I am very happy with the purchase.