Yes. If you have the money, and you've already been to the dentist [1], spend the money on a chair. Either you will (god forbid) not live to be forty years old -- in which case you won't miss the money -- or your forty-year-old self will thank you. So will your fifty, sixty, seventy, eighty and ninety-year-old selves.
(This is not to say, by the way, that you might not experience chair-related pain in your thirties, or even earlier. But the odds do seem to go up in middle age.)
My only concern -- highlighted in the article -- is that my Aeron isn't enough. I'm amused to find that experts think the thing is too low -- it is too low. But maybe that was partly because my pneumatic cylinder was about to go out -- mine just went. Fortunately my chair is also under warranty!
I'll look into these wacky standing chairs.
---
[1] Slightly off topic, but: I wish, when I was in my twenties, poorly paid, and absent-minded, I'd gotten email every six months saying "the dental checkup you're about to skip will eventually cost you something like $10k or $15k in root canals and crowns. Or, alternatively, you could lose your teeth and spend forty years cursing your bridgework and dentures."