This should be a 5 star review except for one issue.
The chair is excellent. Build quality is top notch and the comfort is fantastic. The tilt control is very easily set to just the right setting for anyone's taste and the level of height adjustment is excellent.
I'm 5'11 (180cm) and the back of the chair is perfect. If you much taller then your head may not rest as comfortably as you would like but this will probably be the case with most chairs.
Now, why one star lost? The instructions. I love assembling furniture so the very very basic instructions (pictures only) weren't a problem but they may be for some. The real issue is that, when following the instructions, it is not easy to assemble the chair handles. I had to go against the instructions just to get it assembled.
So, I definitely recommend this chair. But, if you buy it, I also recommend the following additional instruction: When attaching the back cushion to the seat cushion, only lightly screw it in. Leave alot of room for movement. Then attach the handles tightly and finally tighten the screws for the back cushion. If you tighten the back cushion screws first, it is next to impossible to attach the arms tightly. The screw holes may not line up correctly. So, screw back on lightly, screw arms on tightly and only then tighten the back.