We were given this humidifier by a friend who was moving out of town. We live in the dry desert of Utah, and this humidifier has been extremely helpful, particularly during allergy season. Performance This humidifier adds a good amount of moisture to the air. It helps reduce dry skin and dry eyes. The added moisture from the humidifier also seems to help keep pollen down during allergy season. If I don't use it, my nose often plugs up with congestion during the night and I do not sleep as well. But with the humidifier running, the congestion clears up and I am able to sleep much better. As an added bonus, this humidifier also helps cool the air, since adding moisture to air cools the air temperature. The fan blows the cooled air out into the room, cooling down the room. It certainly isn't enough for a whole house, but it does keep our bedroom cooler at night. Ease of Cleaning If you don't use distilled water, you can end up with mineral residue dried on the inside of the humidifier as well as inside the tank that is quite hard to remove. Durability We received this used and have used it extensively ourselves without anything breaking down.