The directions in English were missing a few steps and a few of the holes did not align at all (chair back to seat). But once assembled adjusting for a person was simple.
I am around 6'3"/6'4" and weigh around 180 pounds and I used to play basketball. This chair is perfect for my height and lifestyle. It feels great on my back.
I bought this after months of working at home and sitting on a chair that was part of my dining set. I could Not be happier with my purchase. After working long days I no longer feel the same pains or tightness as before. The chair is solid well-built and comfortable. I highly recommend.