Originally Posted by
Tiberria
The Holy Pally T14 4 pc changed their entire play style and was such a strong output/mana efficiency boost that it was worth using 4 pieces of ilvl 517 T14 over 535 gear. Our T15 2 pc isn't nearly that good; it's a 2-3% output increase, and with gear upgrades available right away, we would be keeping 543 T15 items over replacing them with 574 (heroic) or 580 (H TF) offset/T16 pieces. I just don't see that it's that likely that it will be worth keeping for the entire tier - maybe worth keeping Heroic T15 over normal T16 items, but definitely not Heroic/Heroic Thunderforged.
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Playing around with LFR and the RSS addon on on the PTR, I am getting values for Mastery that are nearly equal to Crit for the same amount of itemization points. In 25H on live, Crit is showing as worth 2-4 times as much as Mastery per itemization point. My overheal (for Kork'ron Dark Shaman) was about 60%. This may be driven by 3/4 of LFR healers having no idea what they are doing and the ilvl being scaled down to 496, but it does appear that the value of Mastery has significantly increased with HR being a smart heal and HST (and it's naturally low overheal) becoming a much more significant component of our healing. However, even if both stats are equal, Crit is still better because of the Resurgence regen. That said, we will have to keep our eye on Mastery; it might beat Crit on some of the heroic fights that appear to have really low overheal next tier.
I am also finding that I really like the Totemic Persistance talent. Yes, on paper, Call of the Elements should be better. However, in practice, being able to use HTT and HST/RS at the same time feels very powerful, and being able to drop MTT the second it's off cooldown instead of holding off for HST to not be up is also a pretty decent gain. With RS making HST such a huge deal, we lose a lot more from having to clip it (for example because you need HTT down immediately) than we do on live. In practice, I think that it will be a bigger output gain than Call of the Elements and probably something I will end up using unless I absolutely need Totemic Projection.