Awesome extension for joomla! It extends the article management features joomla already has and makes them much more powerful. The Restriction system was one of the applications i bought it for, you can deny some user classes publishing rights into certain categories(as many as you want) and this makes possible for some really nice content separation (the mass advertising from genuine news or quality posts). And also the number of links can be limited per post, combined with more content filtering and control options. You can create a very clean content website with this, i highly recommend!