Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Failed within its First Hour

Here's what happened within my first hour using this product: The lines broke and retracted within the spool, so I had to fish them out (no big deal); the extension cord constantly came unplugged, even with it looped to prevent the problem (a hassle); then the final, fatal blow: the drive that turns the spool with its cutting lines failed (the motor whizzed along but the spool did not turn). According to B&D, this unit has a belt drive, so my guess is that it slipped off or broke. I was using the trimmer as an edger, doing fairly light work when this happened. The good news? The product failed early in its warranty period so I can return it.