When comparing Steelcase Leap vs Herman Miller Aeron, the Slant community recommends Herman Miller Aeron for most people. In the question“What are the best ergonomic computer chairs?” Herman Miller Aeron is ranked 2nd while Steelcase Leap is ranked 3rd.
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Pros
Pro Adjustable to nearly any body type
The Leap provides sufficient adjustability to fit all but the most extreme body shapes, and is tested to support 300 lbs. There is also a Leap Plus model which supports up to 500 lbs.
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.
Cons
Con Very firm seat
To some, the seat of the Leap is too firm for sustained comfort.
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.