Instruct: Classify an Amazon review as either positive or negative.
Query: Amazon's over efficiancy/ under availability

Got the line spools and then later was informed that the battery powered trimmer is not available until next year. What am I supposed to do with the line? Almost too much trouble to return it. Lately there have been several items ordered through Amazon that later turned out to be unavailable. They seem good for books and music, but other items are questionable.