I havn't had time or noticed if the mana return on absorbed/dispelled works but the second part of the talent that gives 2%mana 32 RP doesn't appear to be working at all. I figured it just wouldn't work on myself when I didn't get 2% mana back but my buddy made a DK to level with me and he never gets any RP when I cast it on him.
Known bug? Worth droping the talent? Can someone help me out on this one?