The nice thing about Pure to me is the fact that they encourage you to write your own top layer. While Bootstrap 3 says that they also encourage this, the number of components in Bootstrap make it somewhat difficult to learn and implement.

An hour of looking at Pure, however, is enough to get started with confidence.

The grid classes are a bit strange to me though.

`pure-u-1-2` is "descriptive"? Not so much, unless you know the system.