I have room for it, and I'm seriously considering this. Because of how I'm geared, I don't have threat problems. Additionally, although there is little documentation of it, supposedly you do get the full benefit on raid bosses from 5/5, whereas pre-BC you did not.
So, is it worthwhile to get this as a prot war? Point me to a thread I haven't already seen (already saw the Maexxna numbers)?
I am giving up Improved Disciplines (2/2) and Focused Rage (3/3).
The lost rage reduction talents (i.e. Focused Rage) do mean that you have to be very efficient with your rage but if you're used to raiding pre-WotLK, shouldn't be a problem (assuming you're the MT and you also have Glyphs of Revenge and Heroic Strike). I've got 5/13/53 right now myself and so far I'm definitely liking the Improved Demoralizing Shout and Improved Spell Reflection.