- New mesh material which is apparently more supportive
- New back support mechanism which is a combination of the two previous options (which you could not put together) - both the lumbar and the pelvis supports
- Chair is angled 1.8 degrees further forward
- Tilt mechanism causes the chair to hug your body more, with less latency
- A new white-ish color option
Other than that it looks the same.
I'm in the middle of an assessment of both Aeron and Mirra 2, so yeah I've been in the details a bit too much this week...
...as a programmer I find it easy to make decisions based on facts, but when it's a decision based on how something feels, I lock up in panicked indecision and almost always make a choice I regret!
Besides, the Mirra 2 is beautiful, while the Aeron is... debatable. This is mine: http://www.hermanmiller.com/content/dam/hermanmiller/page_as...
I would recommend the Mirra for anyone looking at Aeron. They're usually cheaper too. I got my Mirra on Amazon for around $600 which the Aeron was going for, I think at the time, around $900.
Agree that the lumbar support is more comfortable but PF does have some benefits. I like that they redesigned the arms which support the seat above the part which connects to the top of the gas cylinder. Hopefully this will have less tendency over time to wobble.
If you wear trousers with buttons on the rear pockets, avoid the Mirra. The holes in the back are perfect for catching them and ripping them off.
As for feel stuff I just try before I buy. Buy them on craigslist at market price, try them for several months, sell the one you don't like. Simple. Or try, sell, try sell, buy new.
I loved the Aeron I used to have, until I hurt my shoulder swimming and discovered that its skeleton actually digs uncomfortably against the shoulder. That jarred me out of complacency about the chair's possible flaws, at least compared to others.
The build quality of these chairs is amazing when I consider the tens of thousands of hours I've been sitting in this thing.
Have a search for "Aeron seat foam insert" if you're outside the UK and need an alternative option.
What I don't love is longevity and cost of spares. The original lumbar support[1] was just a piece of plastic, consistently broke after 12-18 months, and cost £50+ to replace. After the 4th broke, an ugly bodge was the answer!
Arm rest pads also split regularly, though less frequently, but a pair cost less than the simple backrest!
Everything else seems to have lasted remarkably well.
[1] https://www.amazon.com/Aeron-Chair-Lumbar-Herman-Miller/dp/B...
The most important part (indeed, all I care about): The wire mesh seat. No more sweatty butt!!!
I bought some imitations in Thailand for about USD $200, kid of meh but had the wire mesh seat so +++
If you are in the states and have the same feature needs as me, Costco sells a faux Aeron (vinyl "wire" mesh seat and back) for $100. Works for me, but my wife is super picky about the rest of the seat ergonomics, so she hates it.
Now what is missing from the comments is a good summary of the differences. I read the comments to I don't have to think for myself and so I don't have to digest the article. I think of the comments as the mturk version of AI article summaries. GET ON IT PEOPLE! :)