Indeed, I'm kitted out with the same hipster mac I suspect the design folks use, yet simply scrolling down was a mess. Not sure what they tested this with :/
Agreed. Also, it seems to have completely broken Ctrl-F functionality. I especially hated how it encouraged resizing the browser to check different fonts, and then just pushed me back to the top of the page making me fight the scrolling system to get back to where I was.