Instruct: Classify Amazon reviews into positive or negative sentiment
Query: DO NOT BUY this piece of junk

My staff ordered 3 of these from our local office supply vendor, and ALL 3 broke in less than a month. The spring tension clips break the flimsy plastic, and in the end they are just cheap pieces of junk. Our office supply vendor was nice enough to refund our money. I've never been so disappointed in a product that I had to write a bad review, but this product should be avoided at all costs.