I've had the chair for about 4 years and I can say with confidence that it provides no ergonomic or "therapeutic" benefit over other chairs. It is a simple and ordinary design with no special features. I gave it a good try, but ultimately feel like I wasted my money.
One size does not fit all and I would highly recommend trying out many chairs before spending money. The Herman Miller chairs are far superior.

The best ergo theraputic chairs there are! Keeps the spine aligned and are extremely comfortable - get one you won't be disappointed.

Chair arrived quickly. Good service. The lowest hight is a bit high for me. Otherwise pretty comfortable although, I thought the back support would be more pronounced.

I bought this chair in 2009 when starting with my PhD. I have spent long hours on it, often deep into the night.
It is still comfortable and in perfect condition.
Thank you!

I used to own an Ergotherapy chair before, but left it at the office when I moved. I am so glad I ordered a new one, it's such an enjoyable sitting experience and the days at work seem to pass much quicker, when sitting comfortable. Best chair on the market.