No-frills efficiency
Here's my opinion after two months of use. Assembly is relatively easy, but will be more so if you can get help, especially for the backrest-seat connection, which is really the crucial part of assembly (you have to put a lot of pressure on two large metal parts). The instructions aren't always very clear, although on the whole they're OK.
The seat in question is extremely comfortable, and its depth is a real surprise: you can sit in the back with your legs crossed, your elbows well supported by the (adjustable) armrests and your wrists falling flat against the desk, in line with your forearms. For my size (1m65/75 kilos) it's ideal: with my chest flush with the desk and my back straight, I can stay like this for hours. It's very easy to get out of this position, and the seat easily follows your movements in terms of rolling, which is handy for moving quickly from one workstation to another (3 computers + screens) on the same work surface. Well, it's new, so we'll have to see what it's like in a few years' time. I'm a bit puzzled by the two control handles: they work, but still, I don't know...
In any case, it's very good value for money as far as I'm concerned.