The chair was very easy to assemble and the only tool required was the supplied allen wrench. It is extremely comfortable and the multiple adjustments make it easy to find the exact configuration for comfort.
The chair is more comfortable than other super expensive office chairs I have tried. The shop assistant and the store manager went out their way to get me the discounted price which was on the tag but not in the system. The only problem was the finish on the base was damaged and I did not notice until the whole thing had been assembled. good purchase!
Our Company purchased 3 Hyken Technical Mesh Task Chairs. They were relatively easy to assemble and they're comfortable to sit on. The extra back support is great and the mess fabric is good for air circulation. I don't use the head rest but my work colleagues find the head rest very supportive when they lean back on their chairs. I'd recommend these chairs.
I found this to be one of the best priced comfortable ergonomic office chair with one gripe. The only issue I have is the chair is too short even though it's adjustable the highest point is still a bit too low for me. I'm about 5'11" and need a little bit of a higher chair than this.