When comparing Herman Miller Aeron vs RH Logic 400, the Slant community recommends RH Logic 400 for most people. In the question“What are the best ergonomic computer chairs?” RH Logic 400 is ranked 1st while Herman Miller Aeron is ranked 2nd. The most important reason people chose RH Logic 400 is:
Pump the lumbar support up, or let it down, for instant change in back curvature.
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Pros
Pro 12 year warranty that covers everything
Pro Mesh is cool (not hot)
Pro Posturefit model promotes better posture
The posturefit add-on provides sacral support that promotes a better upright stance while not reclining, and reduces the need for reclining. This posture is particularly better for computer or desk work. It is important to note that although the posturefit add-on can be removed, it cannot be added to a chair that wasn't built for it.
Pro Adjustable inflatable lumbar cushion
Pump the lumbar support up, or let it down, for instant change in back curvature.
Pro Highly adjustable
Lots of adjustments, to get the perfect fit. Extremely comfortable even for long periods of sitting.
Pro Full length back with headrest
Having support for your back all the way up, and somewhere to rest your head, is very worthwhile for a chair you sit in for long periods of time.
Cons
Con Default lumbar pad doesn't provide broad support
The default lumbar pad feels like a bar across your back and does not distribute support evenly. The posture fit add-on that does a better job providing broad support is build into the chair and cannot be added to one without it already.
Con Expensive
But worth it for the hours you'll be sitting in it.
Con Arm rests not the strongest
Plastic arm rests are useful, but aren't as resilient as they might be, and the plastic can crack and break.