Aerons are designed to have individuals dial them in. My 18 year old or so Aeron finally gave up near the start of the pandemic and I really wasn't sure what to do. There were newer HM models, including the Cosm which was billed as basically a self-adjusting Aeron. However, I couldn't try anything. But it was just for me. So I just ordered another Aeron with the new back support system and I couldn't be happier. Right call. Mirra 2's are OK--we have them at least one of our company offices--but they're not Aerons. (And I prefer the web style to something like an Leap or Embody.)
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I use a Herman Miller Mirra 2. It's fantastic.
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I have a Herman Miller Mirra 2 at home and don't regret the price I paid to get it. I bought it new so I could customize the colors to match my home office. It's a bit cheaper than an Aeron and actually better in my opinion.
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You cannot go wrong with most Herman Miller chairs. I originally started researching chairs because I have was having severe back pain. After several doctors appointments I found the cause, my old Ikea chair. I ended up going with the Mirra 2 and fell in love with it. It completely solved my back pain within two months. The price can be off-putting so I recommend checking out Design Within Reach's outlets (owned by Herman Miller) where you can get Aeron's and Mirra 2's for half off. Hope this helps.
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Herman Miller Mirra 2 and I love it. :)
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First, don't sit for 13-15 hours per day. You will regret it later and it is detrimental to your health. Either pomodoro every 30 minutes and walk around for 5-10 mins or do a combination of standing desk / sitting. Second, I can't sign off on the Aeron it's a good chair - but it's far from great. Personally, and through experience of owning all of these chairs, I would go for the Herman Miller MIRRA 2 chair -or- the Steelcase Gesture chair. They are impossible to beat from an ergonomics standpoint not to mention the countless hours of studied and research that went into these products. The lumbar on these (all) chairs is negligible, cushioning technology is sound, the extendable lower thigh support is pretty sweet, butterfly suspension adjust to your posture and has a solid suspension / cushioning effect, build quality is A+ We have Mirra 2 and Gesture at our office, originally we started with the Gesture and they are fantastic and more "luxurious" but the Mirra 2 is the current star. They are expensive ($1.2k each) when fully equipped. But they are worth it. The Aeron chairs we used to have back in the day were given to people to take home and I have two of them in my garage. Don't get me wrong - they're good chairs - but the Mirra and the Gesture are simply better and not by a little. Don't sit for 13 hours per day. Otherwise you'll be in physical therapy for 13 hours per month. Signed, someone who used to sit for 13 hours per day.