I originally got the Hyken but is was a little too narrow and short for me. I am 5'10" 220. I returned it and got the Dexley instead. So far it has been much more comfortable. If you are around my size I would try the chairs out in store for like 20minutes or just go with the bigger Dexley.
I had a heavily padded chair from Staples for about 18 months. It became uncomfortable and tilted on the pedestal so I used the extended warranty and got this. I have a fairly minor lordosis and never understood why I never liked lumbar support. Because it usually just provides more or less of a bump amplitude that's why. This chair lets you slide it up or down (but not change the amplitude). I found that at the lowest level it actually feels good! The headrest is a little forward of where I prefer it but it too slides up and down (but not fore or aft). I find that I don't perspire as much when I sit in this for a long time. It is quite firm but also very comfortable. I don't know if it's for everyone but it's about the 5th or 6th office chair I have owned and it seems to be the most comfortable. Also: The seat doesn't tilt but the back can (you can allow or disallow it by sliding the lift rod). That's a good thing because most chairs will cut off some circulation when you have them adjusted to a good height unless you put your feet up on something when you tilt the seat and back.
Am satisfied. Chair seems to be sturdy and was easy enough to assemble. Took some time and strength. Only detraction I find from the perfect chair is that the arms don't swivel. Hopefully will serve me for years.