Quyick delivery (4 days from order.  3 pieces, chair, spider (base) and the column between makes for simple assembly (5 minutes or less, takes longer to unpack).  

-Flip levers under base of arms down and adjust for width
-squeeze buttons under arm rests and lift for height
-push back up for lumbar ht.
-rotate knob way under seat to lock or allow tilting
-lift lever under seat for seat height.

Can't get much easier.

Chair appears to be built like a tank.  No worries about my weight (270).

Made in USA

I am a happy camper with this one.