Instruct: Classify Amazon reviews into positive or negative sentiment
Query: unusable firestarter

I was fooled by the numerous positive reviews to think that this is an actual good fire starter. First: there is no shaving tool, so to spark it you need to carry a sharp knife, and eventually make it dull by striking the fire starter. Second: i tried it, shaved a small pile of "so called" magnesium, even though the tool is capable of producing sparks, the sparks would not ignite the shaved off metal. Real Magnesium would have burned nicely, given the amount shaved off. I THINK THE SELLER USED TO SELL A GOOD PRODUCT, HENCE THE POSITIVE REVIEWS, LATER REPLACED IT BY A CHEAPER PRODUCT,THAT DOES NOT WORK. The tool beats rubbing 2 sticks together, but it's got nothing on a lighter.DO NOT BUY.