Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Warning Teachers!

I am extremely disappointed with this pencil sharpener. I bought this for my fourth grade classroom and it worked well for the first year. Toward the end of the year it started to "buzz" when you pressed on the pencil and wouldn't finish sharpening. Turns out one of the gears inside is made of a soft plastic and wears out easily. When I called customer service to request a replacement I found out that my warranty was void because I sharpened a colored pencil in it! I was politely told that I couldn't buy a replacement gear, but could buy a whole new pencil sharpener if I would like! I paid nearly $80 dollars out of my own money to get a decent pencil sharpener only to be disappointed by the horrible customer service. I wouldn't recommend this sharpener to anyone.*Edit - After weeks of arguing with Customer Service I finally got a replacement which I will be keeping on my desk and only using myself, no student's allowed. We will see if it lasts any longer.