I am 6'0 tall and the head rest is adjusted to its tallest setting yet the headrest jabs me in the shoulder blades (approximately 2 inches too low) instead of supporting my neck and head. The seat of the chair is pretty comfortable.
I purchased the Hyken Mesh chair online before I came across multiple reviews talking about the Dexley Mesh chair being the best option for taller persons. I'm 6'4. Because of these reviews I decided to order the dexley in-store pickup. I took the hyken along with me while going to pickup the dexley and while I was in the store I got the chance to actually test these chairs out since both were on display. If you're like me who works 100% remotely or care ALOT about your posture and back pain from bad sitting posture the dexley IS NOT for you. The dexley WILL NOT sit you upright and this could lead to discomfort. The dexley being best for taller folks is a myth. I cancelled my dexley pickup and brought the hyken back home with me and I've been spending more time in this chair I 100% recommend the hyken over the dexley. I'm only giving it 4 stars cos I do wish it had a taller back rest but I'm okay with how it is.
I buy all the supplies for my company and this is by far the best office chair I've found. It is insanely comfortable and the adjustable lumbar/support and arms are a bonus! We have bought 4 of these chairs so far and I'm sure we'll get more