Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not durable

I bought this unit last winter but by the end of the season, it was well on it's way to the grave. Despite low usage due to the fact that I only used it at night, the unit shows quite a bit of damage around the ultrasonic transducer. The gasket around the transducer has swelled up or become detached from its moorings on one side. Also, the paint on the metal collar around the transducer has bubbled up. I guess it can't withstand the supercavitation produced by an ultrasonic humidifier. Of course, this problem could have been avoided if Air-O-Swiss had simply not set the transducer so far beneath the plane of the surface of the unit.While it worked, it was an excellent humidifier and better than units that I had before. But considering that this model was very high cost and has been much less durable than my cheap Sunbeam humidifier, I would recommend people get something else.