In terms of how it works - that part is really good. Just enable it, and it appears in the WYSIWYG editor. Select your categories and horray! it is working.
Unfortunately, articles on the home page do not link properly, but return an error message. The forum has a few hints to a solution, but do not work for me.
It seems that when you're already in one category, the article can be accessed. On a home page, the path is ambiguous - and the error message appears.
I would say this works really very well when you don't have an article that can be linked in multiple ways.