I tried the floor sample of the Hyken Technical mesh task chair which felt comfy with a good back support easy to adjust the height rolls forward and back with an easy slide. The only draw is that the armrest is permanent and can't be adjusted or folded. But you can remove it if you dont like to use it.
I tend to get quite warm so the vented chair is very comfortable. After sitting for long periods my old chair would hurt my hamstrings. The shape of the staples chair is such that when I leaned back very little pressure is on my hamstrings. Additionally I really like the lumbar back support that is built into the chair. All in all I am very satisfied with this purchase. My only complaint which is largely trivial is that a small decorative piece of plastic on the wheeled chair base fell off because it caught on my shoe.
This chair is perfect for me. I'm a huge gamer and with a bad back pain develops in the upper and lower areas when I sit for long periods of time. I do not have any issues with this chair. I can sit for hours upon hours with no pain. It's so comfortable I almost fell asleep at my computer.
Great lumber support. Had tried several other chairs in store and found this one to be the best deal on sale as well as the most comfortable for my needs. Having a lower back problem this style chair helps keep back better aligned while working.