Reviews of the various Air Innovations ultrasonic humidifiers generally say the product works well. Reviews are mostly positive, but some reviews cited problems with the humidifier breaking after a short time.
One review does note that the company responded swiftly to the broken unit to send a replacement. Most reviewers of humidifiers ranging from 1.1 to 1.6 gallons note that they last a few days between refills. However, one reviewer mentions they last for shorter durations if the air is hot and dry. A few reviews don't like how much noise the 1.37-gallon version makes, with one reviewer saying it kept him up at night.