Andy, I converted the method into a standalone function (it was used in a bigger class).
You can use it by simply calling get_acf_title( get_the_ID() )
On ACF admin you add a metabox with title field (which is set as a text field).
Here is a quick view of the admin part:
http://img.iamntz.com/jing/2014-01-30-15@15h24_4.png
