First of all, if there is already a thread regarding this issue, I appologize (and could you please direct me to it?).
Anyways, with the massive nerf bat a couple weeks ago, our 10-man guild is now putting in work on the new slightly-less-heroic Ragnaros. We haven't gotten too deep into the fight yet as we've had some scheduling issues that have kept us from putting in a terribly large number of attempts. We're also going with a fairly common comp with 2 healers (either disc priest + holy pally or disc priest + resto druid).
Throughout the majority of this expansion, I've looked at Impending Victory as generally wasted talent points. However, I got to thinking about how that ilvl 346 caster trinket is so powerful because we spend so much of the fight with Ragnaros at very low health levels. That got me wondering if the specific fight mechanics of Heroic Rag made that talent worthwhile since we are going to spend a fair bit of time below 25%.
So, my question to those more experienced prot warriors out there - is it worthwhile to spec into Impending Victory (coupled with the glyph) for Heroic Ragnaros in 10-man? And if so, what talents are you generally taking away from to get 2/2 into Impending Victory?