Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Buyer Beware!

This product is described as having "hassle-free setup", but even the instructions that come with it tell you it is "extremely difficult" to get the last crossbar pulled into place. Make that "impossible". I even tried a crowbar and still managed to injure my hand in the attempt. I had to return it, and the return postage was $26! An expensive mistake.