Instruct: Classify Amazon reviews into positive or negative sentiment
Query: PIECE OF CRAP!

How this back "cushion" has such high ratings is a mystery to me, it really is a poor product that is nothing as advertised. Rather than support my back, it gave me pain. I didn't even open the packaging and I could feel the cardboard as soon as I rested my back into it. You can also totally feel that piece of cardboard by just touching the back of it and the cardboard wasn't even set in place. Brought it to my car to give it a try and it totally didn't fit since the sides of the driver's seat is curved. Definitely not meant for the driver's or shotgun seat, maybe the back passenger seats. Either way, it is not a cushion in any way and absolutely does not provide any back support. You'll probably get more back pain than prevent it. Shipped it right back for a refund!