I think they’re uncomfortable, but a lot of people swear by them.

They’re generally considered the gold standard in office chairs, and you can get them fairly cheap from office liquidation sales. Steelcase is another good brand if it’s not Miller Time for you

At an old job, I liked my chair so much that I called the barely-visible number on the faded sticker on the bottom to find out what it was, found out it was an Aeron and got me one. The great thing about a new one is the long-ass warranty. An arm snapped off mine maybe 7 years after I got it and they replaced both arms.

Yes, I’d also add Herman Miller Sayl to that list of best office chairs