Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Awful Sharpener

Despite being advertised as being heavy duty, reliable, and good for classrooms, this sharperner is definitely not any of those things. I've tried this product twice in the last several years and both times have been disappointed. Xacto sharpeners are the worst. I've tried other models in my classroom since they seem to have cornered the market with their cheapness. Their sharpeners grind down the pencils without sharpening them, wasting time and money. They're noisy, slow, and ineffective. The blades aren't sharp enough and the motors are too weak.