The problem is the shape of the backrest. These tips just below the shoulder blades toward the back so that you can not lean right and the upper body is therefore constantly tense. After more than an hour sitting in the chair I'm braced properly. Unfortunately, the height of the backrest can not be adjusted, either you have the exact passport size, or you should resort to another chair.
And I'm not very big with 1,80m.
My girlfriend with approximately 1.65 m is the chair but quite comfortable.
In retrospect, I would definitely opt for another model.