Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Spine-Worx back realignment device

I have returned the realignment "device". I did not read anywhere in the advertisement that people with "moderate to severe" SCOLIOSIS of the spine should NOT use this device. I COULD NOT lay back comfortably on the piece, even once, and that after reading the instructions several times. My chiropractor says my scoliosis is "moderate", and that is probably why I cannot use it. Apparently others do not have this problem, because I ordered it based on other reviewers' comments. I was desperate to find something to help with back pain, so was willing to give it a try. I am glad Amazon makes returns so easy. (I couldn't rate it a zero, as that wasn't a choice!)