Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Functional but Unconfortable

This is perhaps one of the most innovative (yet imcomplete) inventions since the watch (time piece). Incomplete in that, it is also the most unconfortable thing to where. Not to mention very bulky. A leather (or some kind of elastic) band would have solved all of that. I returned it in one week. ...did I mention it needed a leather band. Oh yeah, LEATHER BAND PLEASE.