Good comfortable chair. I've been using it for 10+ hours at a stretch (thanks coronavirus!) with no discomfort. Great back support. Head rest a little bit low for my taste (I'm 5'10") but that's probably just me. The seat has hard edges that took me a day or so to adjust to probably due to my previous chair having no such edges and allowing me to spread out without thinking.
I really struggle with lower back pain after an injury a few years back. After using this chair for a week my back pain is gone. So happy I made the investment!