The killer feature of the Aeron is its ubiquity. I have bought three used Aerons, and refurbished them with replacement parts. Because Aerons are everywhere,

The killer feature of the Aeron is its ubiquity. I have bought three used Aerons, and refurbished them with replacement parts. Because Aerons are everywhere, replacement parts (both OEM and aftermarket) are incredibly easy to find. Some of these Aeron chairs are 10 years old, and I can find parts for them now. 10 years from now, I will still be able to find parts for them. Between their overall durability and the availability of replacement parts, I expect that I will be able to keep these chairs going for a very long time. And frankly, that's more valuable to me than any tiny incremental improvements some alternatives to the Aeron might be able to offer.