The Herman Miller Aeron is fantastic.

Humanscale Freedom - I went through 2 in past 10 years, but they probably saved me from having major health issues from sitting 14+ hrs a day (home office, so not even walking much most of the days).

It has two great features -

1. gel seating, which doesn't get uncomfortable ever (wears in about 5 years though)

2. backrest is not spring-forced but responsive to your own weight, so you're basically using your muscles to stay in position needed

other than that, it's built like tank, all metal ;)

http://www.humanscale.com/products/product_detail.cfm?group=FreedomTaskChairWithHeadrest

Slightly biased – but I'm partial to the Aeron and new Mirra 2.

http://www.hermanmiller.com/products/seating/performance-work-chairs/mirra-2-chairs/experience-mirra-2.html

Currently have a Steelcase Leap which is pretty comfortable and supportive - http://www.steelcase.com/en/products/category/seating/task/leap/pages/overview.aspx.

Herman Miller Aeron is the best I've ever used and would recommend.

Sorry to be this guy, but for the past few years I've been exclusively standing and it's been the thing that has made by far the most significant improvement in my work environment, both physically and psychologically (especially the latter).

My back & neck recently went out and I spent half a week on pain meds just to make it through. On the plus side, it motivated me to make a change.

1. I purchased (still waiting for it to arrive) a Haworth Zody chair. I wanted an Embody for years and was about to buy one till a friend told me they sold their Embody for a Zody. I went and tried it, I found it more comfortable, but most importantly WAY more lower back support. I customized some features, but it has the technogel seat insert, forward tilt lock, back lock, 4D arms ( I preferred the height adjustable ones instead ), adjustable lumbar support, tilt tension, seat height and seat depth adjustments.

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1. TwelveSouth HiRise for MBP. Since my chair was expected to take 3-4 weeks to arrive, I needed some immediate relief. I bought this and noticed a change in 3 days. I was no longer hunching over on my desk to see/type on my laptop. I now sit back and look at my screen level and my shoulders/neck are so much better.

I can't wait for my chair to get here, hope that is the final piece of the puzzle towards solving my back problems.

I've had a Herman Miller Embody for 4+ years now, and its a great chair. If you buy it from a good dealer they'll do regular "tune-ups" for free as well.

Honestly, I tell most people its one of the best investments I've made work-wise.

The best chair is the one you don't sit in for too long.

Anything that keeps you from slouching, and doesn't restrict your blood flow or ability to set up ergonomically proper.

http://www.hermanmiller.co.uk/products/seating/performance-work-chairs/aeron-chairs.html

JULES Swivel chair! It forces you to sit straight... It's awesome! http://www.ikea.com/us/en/catalog/products/S99884539/

Charles & Ray Eames EA 117 Aluminium Group. Obviously.

http://www.vitra.com/en-gb/product/aluminium-chair-group

Looking for an office chair at the moment so this has been useful. The Herman Miller Aeron looks amazing but how are you guys all justifying almost $1000 for a chair?

Most comfortable chair I've ever sat in—full stop—is a tempur foam duo-back style office chair: … paid an outrageous amount to get one of these in Chiang Mai. Great for my back, which has issues.

The seats are padded, & absolutely cheap: D

Another vote for Herman Miller Embody http://turbo.paulstamatiou.com/p/2012/pstam_hm_embody.jpg

Herman Miller's Embody. Although it is still in my wishlist.

I've got Markus chair from IKEA. Yeap, IKEA lover... Nothing special but it's good enought for 10+ hours work.

However I'm going to change my chair (no bigger reason) so thanks for the topic!

Hands down Herman Miller Aeron!

At the office I alternate between standing and sitting my my XXL Aeron, usually trying to stand for at least 4-6 hours of my day.

I absolutely love Herman Miller Mirra chairs - even more so than the famous Aeron (which I also had at one point). I can easily spend a long work day (and night) on it without any short term or long term discomfort. They also have great resale value. I bought one used on Craigslist for about $500 and then sold it for around the same price when I moved.

Good thread. I'm in need of a new one for my home office.

Both of my parents work at Steelcase. They have some incredible stuff. http://www.store.steelcase.com

It might be weird, but this is the most comfortable desk chair I have used. Keeps by back with the correct curvature, since the chair’s back is quite short.