This plugin seems to work really well so far. Only one frustration, and that's that the General>DefaultSetup option to have the call to action box only display buttons doesn't seem to work. Every time I select just "Buttons" and then click Overwrite All Page/Post Settings, it forces back to "Buttons and Call to Action". I can live with it - simply by making the call to action text short and to the point.
A classic boundary condition software bug would be my guess as to why, when the call to action text is updated, it updates on every page and post except the most recent post.