For what it's worth, I weigh about what you do (a bit more, sigh), and used a sized-B Aeron (which should've been too small) at work and a Steelcase Leap at hom

For what it's worth, I weigh about what you do (a bit more, sigh), and used a sized-B Aeron (which should've been too small) at work and a Steelcase Leap at home, and didn't ever have any issues with breakage. I also found that regular $100-$200 office chairs would break yearly or so, so I think we must put comparable strain on our chairs. I will also note that you can find Aerons for about half-price used and the Steelcase Leap for an even greater discount (as it is not as well known.) I paid $350 for my current Steelcase Leap, and that included delivery (of myself and the chair) right to my doorstep in the nice older gentleman's Mercedes, complete with heated seats.