Instruct: Classify Amazon reviews into positive or negative sentiment
Query: NxZen Plus 5500 Pure Rubbish

I've work in telecommunication for over 30 years. I rely on my cell phone for my work. I'm very disappointed in the NxZen Plus 5500. The sound quality both sending and receiving are extremely poor. The controls do not function as advertised. After dropping numerous important calls, over several days, I got so mad I turned it off and went back to a much cheaper Nokia. The Nokia cost me $45.00 and works like a champ. The NxZen cost me more than $125 and is pure junk.