Herman Millers are Goated, though i will say their business practices are not the best anymore unfortunately. Though second hand, always go for it.
A cheap chair, a very used chair, or even a slighly used chair is too big a gamble. It is either go all in on a very good chair for long term expectations, or expect to have a soon battle with back pains.
Ooh good stuff. I’ll need to look into that as well.