I can't change the stars but I give it 2 stars. I'm on my third chair (replacement) because the 'lift' mechanism keeps failing. I'm short so I need to have the chair high so I am at the right height at my desk. Since there is a 7-year warranty on the parts I get replacements to fix the chair. I will never buy this chair again and don't recommend it. Despite the height failure the chair is comfortable and adjustable.
First it looked like it was an open box item. Secondly putting it together was a bit of a challenge but totally doable. Finally once put together it turns out to be somewhat uncomfortable!
It's a nice chair for the most part but if you're taller than 5'6" you can forget about using the headrest. I had to remove it because it stuck in the middle of my back.
Love the fit of this chair. I am short and it fits me perfectly. It is super comfortable and the lumbar support is fabulous! I would highly recommend this product!