I've been using add link to Facebook for over a year now for a volunteer/community organization website. Generally the plug-in works great, but how Facebook treats the posts it makes is somewhat disappointing.
My situation may be unique, so I'll describe setup for purpose of review. This is not a technical question. I have my group page attached to my personal Fb profile. The plug-in handles this wonderfully and posts to the correct page as required.
But when I look at the Page Insights on Facebook, the "automatic" posts receive a fraction of the views (reach) compared to posts typed in directly on Facebook's web interface. I don't think this is a bug in the plug-in, but rather Facebook demoting certain types of posts made by apps as part of their algorithm.
The app works fantastic. Replies on Facebook come back as comments on the posts. I highly recommend it.