Instruct: Classify a given review into positive or negative sentiment.
Query: Probably the best one of these out there

Progress continues to be made in the field of hair-yanking. This device has more little wheels to grab your hair and rip it out - yes, it's as fun as it sounds - but this one hurts less than its predecessors, and that light feature was a stroke of genius.I've used several brands of these things and so far this is the best one.