Instruct: Classify Amazon reviews into positive or negative sentiment
Query: perfect replacement for the OEM alternator

Bought this alternator on price and other customer reviews. The alternator was a perfect fit (hold-down h/w, pulley, & connectors) and installed easily. It has been working great for approximately 1 month. I don't know about long-time performance and that is the only thing keeping me from giving it 5 stars.