Reasonably easy to assemble but the instructions are very unclear - 3 pictures and a few arrows. Nothing locks the parts together, so it's easy to take apart again. However, this also makes it easy for it to fall apart, because it's held together by only a couple of centimetres of material and gravity.
Flimsy construction - the plastic crumples at the touch. I suspect the shaft from the base to the seat and the shaft from the back support to the seat will break after a couple of months worth of use.
However the actual back support and seat appear well made and durable. Seems comfortable. The height and reclining controls work fine, the height adjustment for the back support does absolutely nothing.
Wheels work fine.
Overall I expected a better product - I'm not confident this one will last, even with careful use. If you can buy better, I'd recommend you do. If not, then it'll function as a nice enough chair.