Instruct: Classify a given review into positive or negative sentiment.
Query: TWO of this model have failed

I purchased this item thru Amazon.com in late 2006. Just before the 1-year anniversary of the purchase it completely stopped misting. I had followed all of the suggested usage and cleaning instructions and used water that had been thru both a whole-house softner AND a reverse osmosis system. When I spoke with the lady at the manufacturer's customer service desk, she said THEY HAD HAD QUITE A FEW SIMILAR COMPLAINTS and they shipped me another one. In far less that a year of use, the replacement did the same thing. Now, I get NO answers to my phone calls and NO call-backs to my phoned messages. In short their customer service is non missing in action! No more Germ Guardians for me and I suggest anyone else interested in an ultrasonic humidifier look for another brand!!