The hydraulics failed and the chair will not stay up. This is the replacement of a chair that had the same issue. I'm not sure I want to purchase another one from you. They all keep having the same issue...
You get what you pay for. This chair is horrible. The bottom seat cushion is short (front to back) and doesn't support your legs very well. The seat back is very straight up and down so it's not very comfortable. It has very little recline rearward and you can't lock it in the recline position. DO NOT BUY THIS CHAIR YOU WILL BE VERY DISAPPOINTED IN IT. Not worth the money.
I am extremely happy with this chair. I was so impressed with the setup instructions - they were fool proof and included the needed tool. I had the chair put together in less than a half hour. It feels like an expensive board room chair. It's just what I needed for my home office!