I have the chair for a couple months now i will say its the best chair i have used until now its very comfortable. I used to have cheaper office chairs until now, about 100-200 euro, and had to replace them every few years for reasons like material wear and tear on the back and the seat and the height adjustment mechanism having issues like the chair always lowering when someone sits on it, i cant say much on that for this chair since i haven't used it for that long . After using this chair i immediately saw a difference in built quality i was impressed by the wheels, cheaper chairs have small plastic casters that easily damage wooden floors and make a lot of noise this ones are much smoother they roll easily, sometimes too easy even, also there is almost no squeaking when shacking the chair or sitting on it etc. The material for the seat and the back is some kind of synthetic plastic that might seem uncomfortable but when you sit you realize its very elastic and you don't mind it even without a shirt. The chair has many adjustments for tilt back/forward , height, even seat forward/backward and back up/down, lumbar support strength etc. Some of the adjustment levers are plastic so i am not sure how durable they are long term but i don't think they should be used non stop. I am about 170 cm and 77kg for my size this chair is great, i don't see any issue for taller people i would worry more for very heavy or wide people like over 100kg and if you would occupy more than 50cm in width because that's about the width of the seat roughly 51-52cm and it has arm rests , very adjustable as well and soft but they wouldn't fit someone more wide. Also has a head rest, its fine i see no issue with it its adjustable and its optional to attach. Negatives i would say i don't like how easily the arm rests move some times, and how sometimes i roll the chair with very little force, finally i don't like that there is no adjustment for tilt between 90 and 80 degrees since the chair either locks strictly on the 90 degrees position or a bit more relaxed in the 80 degrees. Max incline should be around 50 degrees , maybe even 40 i am not sure about the exact angle, and can lock at any point in the 80-50 range but not in the 90-80 range.