[eevo]

I do sit like this on an aeron chair, leaned back as far as it can go. I almost never have back issues, but in this position (exactly like the far right picture in the article) my neck eventually starts to ache.

Good for back, bad for neck...

[maineldc]

You should check out the freedom chair with headrest. I have 3 and love them for exactly this reason, though now that my daughter has taken over my home office, I never get to actually use them...

http://www.amazon.com/HumanScale-Freedom-Chair-Headrest-Fabr...