Office chair sedentary work about 8 hours

My Story:
I come from Austria and am long been looking for a pleasant office chair, I have to go after a day up to 8 hours of sedentary activity.
A few data to me I'm about 1,90m tall and ~ 110kg heavy and have never been satisfied some of the low chair models of DIVERSE Furnitures (Lutz, Leiner, Möbelix) behind me and am so far.
The most difficult challange to a chair into account my body size is probably the combination of a stable backrest and good head / neck support - which does not seem feasible to now simply.
I just long "sit" with the subject in depth and have to search to Haratech and one of its competitor encountered after prolonged compare I opted for Hara.

To order and Haratech:
It is a company with Japanese origin, the seat of the branch office / Germany is Bayern. Since I live in Austria and HaraTech has no place for me there was no way to test the chair before and of course had my doubts - but I was confident in the choice.
I was immediately contacted by telephone after the order by a very friendly Haratech Support, which I then respect in a counseling session. My order intricate as it is in this chair but rather is an investment.
Based on the expertise of the support I was discouraged because it may lead to painful complications with the flexible elements shoulder at my height from my original order (Nietzsche). (As I said, the height was up to now always my biggest problem)
After a lengthy discussion, the decision has been made on the Zenon, I have meanwhile also at home.

To the chair:
The chair was order after 3 days already at my house. Remarkably positive I have to this the ease of assembly, the chair was completely zusammengschraubt and operational within 5 minutes. The processing of each item that struck me really positive, not just a chair for your back but also for the eye.
The seat is anfänglichs, due to the new technology some getting used to because this conforms to each of the movements but this is warhgenommen very pleasant after a short time.
The backrest supports swayback perfectly what is most important for me.
The only shortcoming is once again the headrest. Until you reach the head, one is already upset - but unfortunately I have no solution for this problem found neither in Hara yet where else.

Conclusion:
I advise all people from 1,80m before talking to the support or to seek advice and to test if possible.
Pro:
Chair, Support and Technology impressive, very enjoyable and recommended.
Cons:
Headrest too far back mounted - until you reach a comfortable position, you're not far from a deckchair.

5 stars and a recommendation from me.