Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Junk

I purchased the 8" model to speed up the sanding process on large timber beams. I was very disappointed. When I started using the sander I found it very difficult to control as it vibrated a lot. I decided to call customer service to see if there was something wrong with this unit or not, but they never called me back after I left a message with an actual person. In the mean time I kept using the sander until the pad tore loose from the motor. This macine felt very cheaply constructed for its price. It was about the same quality as I expect from Harbor Freight tools. Also the on/off switch is in a terrible location. Thanks to Amazon and its great customer service for allowing me to retun it for a full refund as it was clearly defective.