This is one of those plugins that just does what it says. The instructions (for setting up the developer account on Facebook, getting the authentication codes, etc.) were clear, concise, and helpful.
Once you have the necessary information, setup is a breeze, and the plugin worked instantly.
Also, I happened to have a support issue with one of my PC's (it wasn't working the way it should). Danny was quick to respond, and was willing to take responsibility for whatever was wrong. It turned out the problem had nothing to do with his plugin; but the fact that he didn't try to say something like "it works for everyone else, it must be something on your end" made me feel like he and his code could be trusted.