Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Junk

I have had to get two of these because the first one I received malfunctioned straight out of the box. I used it for about 2 hours, went to try it again the next morning and the thing wouldn't run. They sent me another which has acted up a few times but operated enough for me to buff scratches out of my friends car. Buy a name brand, not this thing.