I had a herniated disc in order to work as quickly as possible to 2 months ago, I was looking for a good office chair. On the Internet I came across the Harastuhl. I liked the concept, despite the price I have left lead and ordered the chair of the positive reviews. Delivery was prompt and without defect, in 10 minutes you've built without any tools the chair. From the beginning, I could at least 4 hours per day relatively painless sit in the chair, that's not possible with our conventional office chairs. 2 month after the incident, I work now back up to 6 hours a day. Absolutely happy with the product.