The back of it is fabric which is comfortable and most importantly breathable.
The high back and headrest is good, most other chairs are too small i dont really rest my head but shoulder support is good.
Seat is good and wide enough, couple of other chairs i have used are not deep or big enough (and FYI i am not fat or anything).
Good quality and strong build, 10 year guarantee.
For me there also must be a balance with comfort, you cannot be too comfortable, super comfortable chairs are for sleeping/watching TV and stuff.
Im not sure I can understand your last point. Surely you are not suggesting a super comfortable chair is pointless as you will fall asleep and not work effectively? If that is the case you are showing a little bit of a misguided perspective as comfort is fundamental to any good chair.
I have no axe to grind here, it isn't about buyer justification for me as I have a Markus, sorry I should say had, I gave it away this week. Knowing how full of make believe this place often is, here is a lovely picture I took of it sitting at the bottom of my stairs awaiting collection...
So my criticisms of it and comparisons to a quality product such as its replacement right here...
...are based on a little more than gut feeling or "I got one so it's ace" which proliferates this place.
Now not everyone can afford £600 chairs and I appreciate there are good office chairs out there for less, but please don't try and tell me a Markus is on the same page as this or even a particularly good design, for it has many problems. I also appreciate that Mr Average 25 year old could sit on a lump of dog crap and find it comfy and causing of zero problems, but that is due to being 25 and, something I said goodbye to 20 odd years back.
Markus is fine, does a job, but please stop trying to position it (for those that do) as anything more than an OK cheap office chair that looks a bit funky. If you struggle with back issues or bum pain the Markus is not a good option because, simply, its not a well designed ergonomic chair, its a cheap chair sold to look nice and give the impression of quality to those who know little better, which is does VERY well.