Instruct: Classify Amazon reviews into positive or negative sentiment
Query: back breaker

I visit a chiropractor once or twice a week to correct subluxations and for about two weeks I attempted to use this contraption instead of visiting my chiropractor (who was unavailable). While that opening line may not add to this review, at least it adds some color to my story. I had a horrible experience with this unit because of the uncomfortable nature in the design. I was in * MORE * pain after using this (in my opinion) torture device than before I used it. I even took it to my chiropractor after he returned from his two week vacation and he disapproved of it. I would NOT reccommend you buy this or any other medical device without consulting your physician or health care professional. I only kept this unit because I had hoped that it was simply a case of user error, but it was not. I had friends try out this device, and they couldn't even get up off the floor after using it! Don't waste your money on this worthless product. See a professional and seek out their advice first.