They&#x27;re adjustable (so aerons can be at least ok for ~everyone), and durable, and pieces can be replaced.  It&#x27;s like commercial kitchens vs. home chef -- more expensive, but flexible, and meeting a lot of standards&#x2F;requirements which make sense in commercial settings but not in one-off settings.<p>There&#x27;s probably a $100-200 chair of some design which works better for each individual than the $1000 aeron; it&#x27;s just a <i>different</i> $100-200 chair for each person.  And it probably will not last 7 years in daily hard use.