Very nice, and has lots of components. I like it.

Regarding the semantic-ness of the class names - I see people complaining that "ui three column grid" is not semantic. I don't understand what the big fuss is about - how could a generic, non-preprocessed grid be semantic ? It's presentational by definition, and the class names reflect that. If they implemented the framework as SASS mixins, sure, you can be as as semantic as you want when you use those mixins. That's what I like about Foundation. For example:

  .my-foobar {
    @include grid-columns(3);
    @include panel;
  }