Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do Not purchase

I purchased this on September 12, 2009 and was sent a defective unit. A replace was sent out and arrived in a timely manner. However, the replacement only worked 4 1/2 months. Now , I need to return it for a replacement and see you have very little options and only receive partial credit. I will not purchase anything like this from Amazon again.