Agreed. I gave up a couple sentences in and had to run it through Readability to read it. Hairline fonts (Helvetica Neue Ultra Light, in this case) are not really intended for body copy.

Of course, the font choice is not the only thing that makes this practically illegible. It's too large, the leading's cramped, and it could probably use a max-width to prevent excessively long lines in larger viewports.

Fascinating article, though!

It borders on unreadable. I feel like I'm in the first row of a movie theater.

I really like how most browsers have a very usable webdev tool, so I just changed the font, line-spacing and document width until it was good. I don't always go through that trouble, but ihn this case the page was simple enough and the content seemed worth it.

It was pretty obviously only tested on OS X: http://i.imgur.com/g1thFBk.png

The OS X rendering is ugly, but the windows rendering is unreadably thin.

In Firefox:

Alt+V, y, n