Went with the Steelcase Leap after a lot of research. Was advised not to get an Aeron without testing it.
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Intentionally got it without the factory headrest, because there's a better headrest hack available if you want to add one. Concerned about manufacturing defects with the Leap which I heard are pretty common. It's also rated the noisiest chair, good amount of creaking and so lithium-lubricant of joints recommended. Other concerns with the Leap are the foam seat, which holds a lot of heat. I didn't get leather because I like the option to wear shorts and skin catching on leather is no good. Leather would have displaced heat and solved one potential problem with the Leap.
Was very close to an Embody in the end, but the armrests potentially clashing with the desk put me off for now. If the Leap is a huge failure I'll get an Embody out here.
If the Embody had the Leap armrests, it'd have edged it out.