Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Can't believe it works, but it does

Looking at the back joy, there was no way I was going to spend that kind of money on a little seat. However, after trying one out that a friend had for about 15 min. that was enough for me. Went home and straight to amazon to buy one. First night at work, after about 4 hrs my hips started to hurt. Walked around for about 10 min. went back to it and was fine. I use it at work and back into my car it goes to use it there. It really works for me. Once you learn how to use it properly (it took me a few tries) you won't want to be without it. I sit for 8 hrs. and this really helps. Tonight I just paired it up with a mesh lumbar back rest (you know the one) and now I'm double happy