I can't complain about this chair.
For the price, it's a very, very good chair.
I have seen chairs for over £600 that have similar features to this chair, and this chair is far more comfortable than any hard back chair that I have ever used.
It's quite durable being made from plastic mostly, as compared to really cheap steel, which can snap within months of use.
It has an adjustable head rest, which many chairs do not.
It has a foot rest which doesn't come flying out of the plastic slots every time you use it.
It has a very good design for the reclining function of the back rest, so the reclining function won't break on you, like it will with some more expensive chairs.
Over all, for build quality, functionality and comfort, I really can't complain.
Once you've gotten the bits out of the box and mocked it all up, it's just a case of sorting the screws out, and bolting it all together. It shouldn't take more than 20 minutes to build up. I would be surprised if construction took more than 10 minutes, to be honest. You only have to look at the components, to know where all the parts bolt together. There are only so many screw holes on each piece, which must all line up properly. After that, it's just a case of putting the correct screw into each hole and tightening it up. You shouldn't really even need instructions, other than to tell you which screw goes where.
It is also very light compared to other chairs also, which you would expect from a fabric, mesh chair like this, since there is a lot less weight in it compared to hard backed chairs.