Very comfortable chair and support for lumbar region of the back. The headrest could be an inch or 2" higher to provide more head support when sitting upright in the chair.
I can’t sit with my back straight while the headrest is attached because it digs painfully into my shoulders. I’m 6’1”. The chair back can’t be adjusted up/down like other chairs to account for this. Other adjustments can’t be made in the fly or simply don’t exist. Cheaply constructed - with cheap sticky castors.