This chair was much harder than previous office chairs.  The hardware are not labeled and did not match instruction pics (some previous furniture you could lay screws on pics to match).  The drawings were not always clear.  This all added unnecessary complexity.  We have built so many office chairs over the years we can usually put them together without instructions.  When we finished we realized the lever to raise and lower the seat was badly cracked.  It keeps falling off so we will need to find a way to fix it.  We do not want to take the chair apart to get this one piece fixed.  The chair looks nice and is comfortable.  I would buy a different brand next time but my son loves it.