(Disclaimer: I live in EU)

I have an office chair from a Swedish company, RBM-765. It's quite adjustable and worth all the money that I paid for it.

The quality is lot better than the usual Ikea chair.

Watch https://m.youtube.com/watch?v=cslQsqSalqc to see the different adjustments.

I got it recommended by mech engineers who worked on chairs for disabled people.