Looks like a very intuitive way of connecting paths together in a more powerful way than just having lines. I like the way you can draw part of a segment and then go back and add more line segments afterwards: the line cap for three meeting points is a lot more impressive than it looks.

The ability to fill sections and then punch out holes makes it really easy to see what's happening as well.

The post has a number of animated gifs which show how these work: it's worth reading to see them.

The only thing that sucks is the name. Essentially it's a tool that has more impressive path editing functionality than I have seen in other vector editors. The name of this post doesn't do it justice.