I haven't seen the code but the examples for Checkbox/Radio Buttons are not accessible. If I click on the label, they do nothing.Ideally, they should toggle the checkbox/select the radio button.
I just made a WordPress port of skeleton, a quick look at foundations shows it to be very similar in terms of the responsive CSS, in fact they use exactly the same CSS, based on the 960 grid. The differences are foundations has a lot more "stuff" you can see in the github /marketing folder. It contains a slew of layout options, .php examples, javascript, fonts, etc, some are actually quite interesting and worth a look.