They usually go on sale for about $22. Wait till then if possible. If you can't it's fine. Assembly should take you less than 15 min. Make sure you sit on it after you read and it's fully assembled. The pressure will make the hydraulic snap into place. Then release the pressure by getting off from it. So it can lift the chair. Now enjoy you're office chair. By spinning around on it.
Arrived with loose screws in the box and a major piece was broken. Quality of plastic is very cheap - would not trust this chair to support anyone.
Box was missing some parts so I wasn't able to put together, I tried to call the number on the instructions to see if they could send the missing parts but number is not in service. Now I have to go through the hassle of returning the chair.