Compared to the 10k mana usage It was very obtainable to withstand the 5k in PVP. I am able to withstand my grace just fine. I find it superbly helpful for the overall survivability of endgame pvp. As you say, it can most def increase a characters HP by more than half, which is amazing. With my gear I can be full vit and have a huge mana pool, or psy and have a gigantic mana pool. I am actually a huge advocate for using priest in endgame pvp vs rumir (mind you I have a really bad ass rumir w/ over 350k hp self buffed and a set that sunken mobs hit me the most 500). However when the staff mastery was changed (once again) I cant heal as high as I did before---- and that's the problem w/ priest. Not the grace but the healing potential went down. Don't let me talk about the new heal cooldown now.