HI, I bought this chair in April, delivered a month later in May 2021.  At first it supported my weight ok, but right now the height adjustment cylinder does not hold its position at all.  I adjust it up to highest setting since I have 2 new hips and it will hold for anywhere from 10 secs. to 5 min., and then it just starts loosing the adjustment and sinks to the lowest setting.  this chair is now garbage to me.   I can not sit that low in a chair.  I am 6' 1", 230 lbs. and thought this chair could support me.  I was wrong. It should have been rated at less than 225 lbs but don't think that is even low enough since lighter people than me have experienced same scenario in my chair.  I was trying to deal with the regular inconvenience or   I don't recommend this chair.  Makes me question online shopping.    Sincerely, Chris B.