Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Wastes Lead and Very Uncomfortable

Once you get down to about the last 1/4 of stick of lead you are using, the tip fails to hold the lead in place (so that when you try to write, the lead is pushed back into the pencil). This forces you to waste 1/4 of every stick of lead - which is not only an annoying inconvenience, but also is expensive. This should not happen for a 15 dollar pencil. Furthermore, although many may disagree, I found the pencil was exhausting to use because it was so heavy and unbalanced. Thus, looks and nifty features aside, this pencil fails at the most basic functions of a mechanical pencil.