I'm sorry I can't help out with any comments. I wasn't able to make it to Chicago this year.
I was curious if you were able to capture any images of the new Humanscale chair designed by Neils Diffrient? I believe it is called the Diffrient World Chair. Core 77's overview only included a image of the chair with Neils sitting in it. From what I can see on the Humanscale website, this chair is very similar to the Liberty chair, a great chair IMO. Could you comment on how the World and Liberty differ?
I was able meet Neils a couple years ago at Neocon. He seemed like a great guy and I am left completely impressed by his designs.