Hello
I am having big troubles with using large radius bright lights and Directional Lightmaps in Unity 4.3 (and previous 4.x versions).
Unity bakes Scale Map with Completely WRONG light vectors ! 
This issue makes Directional Lightmaps almost impossible to use it in final release of my project, all lighting looks just broken, it is very critical point for me because Directional Lightmaps is one of the Top reasons on which I bought a Unity Pro.
Here is a small example project that shows the issue: https://dl.dropboxusercontent.com/u/8913813/UnityFeedback/Directional_Lightmaps_issue.zip