I think it looks nice, but usability seems to have taken a hit in some strange places. For instance, the sub-header is gone. In the old design, say you clicked on "Support". On the support page, directly under those big tabs, were links to sub-sections — Downloads, Manuals, etc. Now, these links are in scattered throughout the page, some in sidebars, some beneath the content areas, some (apparently) missing entirely.
Also, it only looks nice on pages with dark backgrounds. This stands to reason, since they're using the UI appearance from OS X that is only used for darker windows (brushed metal and dark-unified). On pages with white background, it looks a little out of place.