Also, via a mastodon promotion campaign by @sinbad I got myself a Hag Capisco Puls chair recently (at $500, so yeah, not cheap at all);
I do love the build quality and find myself changing sit posture quite a lot, just because it has so many knobs to play with.
A few things nag me:
1. its backrest is a bit wobbly and AFAIK, by design.
2. it is somehow less comfortable *with seat cushion installed*.
3. it is sometimes called the Joe Rogan chair because of his show and recommendation.