Thanks! The headrest is absolutely an essential accessory for me. I don’t find it particularly useful for me when I’m sitting up straight doing actual work. Where it really shines is when I’m off the clock lounging around at my leisure where I can typically be found leaning all the way back in my Aeron for extended periods of time reading, watching a movie, or whatever. I don’t remember being able to do this comfortably without a headrest. I paid over $150 for mine which admittedly is a bit steep. Yet, despite this, I can’t imagine having an Aeron without it. But that’s just me and how I use it. At the very least, I think it’s worth trialing out.
Here’s the Amazon US link, in case you wanna research and check it out yourself: https://www.amazon.com/gp/product/B005L9ATK6/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1&pldnSite=1