Let me help you - you are looking for feedback on THIS chair, right? Show Image
(http://www.ergohuman.net/media/catalog/product/cache/1/image/9d99c3f753f1b2ead06e02a7b93f28ec/e/r/ergohuman-plus-mesh-office-chair.jpg)
Jup, that chair. I supplied some links in my OP.
I’m not sure if anyone here has experience with that one in particular. Looks reasonably similar to Herman Miller, Steelcase, etc. chairs. Maybe there are reviews online somewhere?
Personally I’m not a big fan of those kinds of chairs. I really like a chair that supports more different sitting positions. I’ve been using a HÄG Capisco chair for the last several months (along with an adjustable-height desk), and I really like it. It can be adjusted for sitting like a regular low office chair, like a tall saddle-seat, reclining with arms propped back on the armrest, or sitting backwards, resting the forearms.
Here’s a picture showing a woman sitting in some silly ways:
Show Image
(http://www.chairholder.de/publicdata/cms/reports/142/590_04.jpg)
I don’t do most of those, but the picture gives some idea of what’s possible.
That looks like the most fun a person could possibly have sitting in a chair.