Quite comfortable and easy to build, coming from the Ikea markus that has a tall back this is a much smaller profile chair.
It just about fits my profile however it could do with another inch either side of the seat and 2-3inch on the backrest, as a 6foot 2 dude at 118KG i seem to be right within the margins however i feel this is incorrect, sitting upright in the chair, its headrest is more of a neckrest, barely reaching the base of my skull. Luckily the cushion provided saves the comfort level, however does fall off as the backrest is too short to have the cushion attached at the right height (just sort of perches on top to be at the right height).
Another way of fixing this chair would be to give more holes for the backrest bracket to attach to, having a inch gap between the seat and backrest to have an extra inch up top would have avoided the little disappointment i had, i saw it one one side and though 'oh thats clever' to have no matching hole on the other side.... so would be lopsided.
To sit comfortably it needs to have a small recline so i can slouch down a little to be comfy. The lumber is good so far however this could be due to having the ikea markus which has no recline (just tilt) and no lumbar support to speak of.
I would recommend the 'recommend size' is lower to 6foot and just be aware if you are over 110KG (weather muscle or fat) your thighs may not sit comfortably on the seat (without squashing your gentleman) and be half on the raised edge digging into your legs.
Of course i couldn't test the chair before purchasing and no returns are allowed after assembly so not the worst outcome however i do feel that someone under 6 foot lied when they tested this chair XD
I would recommend this chair but would advise not to go off the advised height, measure the backrest against your own back to see where it would come up to.