Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Buyer beware

I purchased one of these 6 months ago. It has already stopped working I paid over $300 for it and now they(sharperimage)are telling me I have to pay to ship it back to them and they will send me a used one to replace this unit. So I paid for a brand new unit that worked for less than 6 months and now I will get a used one, I wonder how long that one will work. I wish I had done more research on this.