Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Build your own better and cheaper

It amazes me that companies still try to build and sell equipment like this for such a ridiculous mark up. With a few basic tools and minimal skill you could build your own out of heavy duty plumbing pipe that would be much sturdier and cost less than half as much. This probably cost them a few bucks to manufacture and might be worth $20, but definitely not what they're asking for it.