This addon displays MUCH more information to the screen about hit chance for melee, archery, and most of the talents that give the player or npc a chance to save. It helps one understand the importance of DEF, Physical/Mind/Spell Power and Physical/Mental/Spell Save, and their interaction. A LOT can be learned about the game by using this addon. Because it overrides many key files, assume it is incompatible with other addons.