I agree. The Embody is a great chair if you have pretty good posture. It is pretty rigid in the center (all the flexibility is on the sides), so that it forces your back into the 'proper' shape like a plastic mold. The problem is, it's a pretty hard chair, so if you have any 'irregularities', like, say, a bit of hunchback (thoracic hyperkyphosis), the hard plastic "pixels" will just dig into your back in all the places that stick out where they shouldn't.

There is a single adjustment knob for the back, but it adjusts the thoracic and the lumbar part at the same time. So if you have a rounded upper back, you'll adjust the knob to make the backrest a more deeply curved S shape to prevent the upper backrest from poking your shoulder blades. But then the lower part of the S gets deeper as well and it starts digging into your lumbar/sacral region. It's not easy to notice -- after 15 minutes in the store, I was in love with the Embody; after 1 hour at home, it felt like my lower back was covered in bruises from the hard plastic.

For this reason, I do not recommend the Embody to people with incorrect posture, or to people who don't like hard chairs.

Other things worth noting are the poor armrests (they have no back movement, so you can't move your chair close to your desk without lowering them) and the fact that you can't really recline very far in this chair because the back tension rises pretty fast after a certain point. Well, you can recline if you adjust the back tension, but it's a continuous knob, so it'll take you ages to go back your regular setting.