Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Essick Air/Bemis Humidifier

This is the fifth time I have bought one of these humidifiers - three for myself (for different areas of the house) and two for other family members. This is an easy to use, quiet, inexpensive-to-operate machine which is durable and effective. Filters can be purchased at any Ace or True Value hardware store; they are available as branded or private-label. I highly recommend this humidifier for anyone who's got dry skin, dry hair, valuable wood furniture, pulmonary problems, or a piano that wants to go out of tune in the winter. It's a great product.