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

Having purchased other Porter Cable products in the past, I had high expectations for this tool. I previously worked with a Makita 9.6 volt unit and wanted to upgrade to a 12 volt product. After six months of fairly light use, my first unit broke at the stem beneath the keyless chuck (above the torque adjustment). A local retail outlet replaced the tool with a new unit, but the battery failed after a few months on the replacement unit. I have concerns about overall manufacturer quality, however, the tool does perform well.