The reason for the purchase of this chair was that I had a herniated disc (each / r of or had something ever know how much that hurts ... disgusting!). I could painlessly neither lie nor stand nor sit. I have the chair then practically grew admit as an emergency order: ordered in the evening; the next morning he was already there - worked great! The assembly was totally easy, not to say: foolproof. With this chair I could actually sit without pain. After weeks of pain that is like a release. I hold this chair for a medical device (and should be funded by the health insurance ...!). My pain is now thankfully past; the chair has remained my favorite seat, because this simply sitting in motion is most pleasant.
