[jhy]

[Self-reply] I ended up getting the L size and am very happy with it. The XL was only a little taller (1cm), but wider.

Still getting used to it, but first impressions are that it's comfortable, helps give good posture, and the rocking & recline options are great to mix things up.

It's my first gamer-style chair vs a regular office chair. The side bolsters and head rest are a great addition. I have often felt more comfortable in my car than in my office, and this is a step towards that kind of setup.