Have used for about one month. Attractive and fits our home (and probably most decor) reasonably well. Auto mode is generally whisper quiet and not noticed even when the house is otherwise quiet. Once something burned in the kitchen (about 18 ft away) the light turned orange then red and the fan kicked up to a higher speed indicating the sensor is sensitive and working. Hard to measure accurately but we believe it has cut down on dust and pet dander. Pleased with the purchase.