Build quality is as good as the ergohuman that I went to try out but for half the price. Functions are exactly the same for half the price and comfort and back support is superb. Only down side is ergohuman has 5 years warranty but sail has 2 years warranty. Wanted to share this caz i have been researching on a ergonomic chair to buy for the past 6 months before this decision. The shop that carries the ergohuman also has a chair called ioo. Which has an excellent headrest that moves with your head. I love it but the price is same as the ergohuman which is over my budget. For the savvy shoppers and best bang for buck, consider the sail chair. have fun!