Bought this chair a few weeks ago. Its been great for me to attend online classes and meetings at home. I also use my desk at night for some gaming with my friends. Typically I have been using it for about 5-6 hours in a day and have had no problems so far. I am also 6 feet and personally have had no problems with the chair. I did test out the chair for a long time at the store before purchasing it which helped a lot.
I love the chair. Comfy in every where and love the adjustability. The one issue I have with it is that since the chair is curved towards the back of your spine it bothers my lower back. But I fixed it by putting a small pillow there. I would buy another if I needed !