Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Heighly Unreliable

I bought this unit two months before. It worked great until now. Two weeks before it started blowing vapor from bottom and stopped pushing vapor from its mouth. Today it completely stopped working, would not make any vapor. It does not know anymore that it has water and always has empty tank indicator when the water is in the tank.It was great while it worked. But it is highly unreliable. It wasn't very expensive to buy on the bright side.