my reasoning is actually that all desktop work chairs just suck ass. a 10 dollar one piece plastic chair beats all of them - your ass doesn't sweat, you can lean on them, they don't roll out under you - they don't roll around their axis(this one is particularly annoying because WHO THE FUCK really needs a rotating chair?? that rotation and roller wheels are the worst fucking idea ever. I mea, who the fuck comes up with that idea and thinks it's a good choice for a worker who keeps constantly pushing on buttons on the desk and moving an object around the desk? ? fix problems for the 99% by removing the wheels, rotation and smelling cushion and let the hipsters have the stand up desks).
Well, I use my rotating and rolling chair all the time. Besides the value to sysadmins, which I have found to be significant, it's pretty much mandatory for anyone who has a filing cabinet right next to their desk. I also sweat in plastic chairs, maybe because I am fat. Still, it's true. Actually, I found this to be true way back when I was a child, when I was not fat. That didn't really happen until Jr. high.
The only office chair I know of which is worth one tenth of one shit is the Aeron. It's still one of the most ergonomic chairs around in spite of not actually having been designed to be particularly ergonomic. The goal was to create "the office chair of the future" and obviously in the future, your chair should be fully adjustable. As it turns out, there's many different body types and sizes of human, so full adjustability is what's needed for ergonomics. I literally sit down in this chair when my back hurts. The combination of good posture and good lumbar support is unbeatable. And I bought my Aeron used, so I didn't get completely mauled on the price. And it doesn't have cushions to stink up or make you sweat, either.
If you spend a lot of time sitting in an office chair, you want an Aeron. I don't care how much markup they have. Of all the shit that startups wasted their money on back in the dot-com bubble, the chairs were the least senseless.