> The Mirra has recently been commandeered by my SO, so I bought a used Aeron for $200 to replace it. Not nearly as good for my frame. Ill probably replace the Aeron with a Mirra 2.
Miller isn't the only one making nice chairs, have you considered e.g. Humanscale's stuff? (spoiler alert: I've used a Liberty for the last 6 or 7 years and have been very happy with it, my only kind-of complaint being the gel seating which is comfortable but gets too warm/humid in hot summer, but their most recent chairs have mesh seating as well as back)
Miller isn't the only one making nice chairs, have you considered e.g. Humanscale's stuff? (spoiler alert: I've used a Liberty for the last 6 or 7 years and have been very happy with it, my only kind-of complaint being the gel seating which is comfortable but gets too warm/humid in hot summer, but their most recent chairs have mesh seating as well as back)