I have used this extension on my small non profit association page. Works just fine and I experienced no problems doing the install proces. There are many constumization options. Only con is that nothing shows in the sidebar when the user is logged out of facebook. I would prefer a "log to facebook" or something similar.
Like Box shows empty when on Facebook Page Permissions Settings are set age or country restrictions. Change it to allow access for Anyone (13+) and leave blank country restrictions. This options can not be changed in module. Facebook does not give such possibility.