Bought this today and I am so impressed! I have serious back problems and have tried many different chairs, including one of those ergonomic kneeling chairs, but nothing has allowed me to sit for more than about 15 minutes without severe pain. I have been sitting here now for around 2 hours and I feel fine. The adjustability means I can set it up to the exact posture I need.

I bought this chair to replace my 20 year old office chair. It's comfortable, easy to build and adjust, providing good back support.

I've this product since 4 years ago and it work perfectly for myself. However, until we have a taller colleague and found the back rest can be pulled up but won't stay. We found that there is nothing to click. To keep it stay at a higher position, you have to lay on it all time. Once get up from the chair, the back rest dropped. If it is someone similar to my height (150-160cm), yes, I'll recommend the product. However, for someone taller, I won't recommend this product.