Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: not reliable

At the first two days the product worked just fine (misty and quiet). After the second refilling the humidifier started to make noises (a motor like sound the first 10 minutes and heavy drops sound all the time). - So I had to return it.Secondly, to refill the tank you have to remove it and turn it upside down - Water always get spilled on my carpet during that process.