Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Refurbished never worked

We are big Harmony fans and happen to like the 880 a lot. We went through the process of ordering two of these refurbished models, and on both the channel up/down key didn't work.We went and got a new 700 instead.Bottom line: love the products, but the quality control on the refurbished ones seems to be an issue.