When I first opened the page, the text was displayed in a "Times" font, which looked very crisp but surprisingly bland, considering the topic of the text. I have NoScript running and I realized it was probably blocking the script that downloads a custom font. (In this case, "Karla" from googleapis.) Digging deeper, their css rules don't specify a fallback font (the css file does, but it is overwritten by an inline style), so Firefox defaulted to the 'Times' font.
Ok, I thought, let me see that font-magic they are talking about in action, and I enabled scripts on adpushup.com. The result was... suboptimal. The letter spacing was huge and the fonts were extremely blurry.
I probably can't blame them for the fact the font displayed blurry. (A Firefox problem? Maybe Windows? I don't know what is going on in the background.) But I can, and I do, blame them for not being aware of the blurriness problem (Windows XP + Firefox can't be such a rare combination) and for not specifying a proper fallback font.
Well, those two things bugged me enough to stop reading.