Aeron. Get one from Craigslist for $300-$400, sell it for the same amount in 5 years if you get sick of it. I did that with a size C after I lost some weight and found a size B more comfortable. From a TCO standpoint, it’s cheaper than buying an IKEA chair once every 5 years, or an OfficeMax chair...ever. And, during the whole time you own it, it’s a nicer experience than either other option. Steelcase and HumanScale…
Re: Ask HN: What office chair do you use?
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