its a brilliant talent, the shere number of tanks not speccing or glyphing into it as a big part of their spec is ridiculous, dont understand why there not taking advantage of it
Heroics I find it pretty useful, Due to being a good change to land a KB against 3 dps unlike what Kazey said against 17 dps. Raid wise its pretty much useless.
Soloing, Grinding, Heroics is more of its use.
Uhh it's extremly hard to get a mob below 20% without killing it while soloing/grinding. And than you have to fish for a proc - when you will be able to use Victory Rush anyway soon after that. (Only exception may be doing old content weher nofmal VR does not work, but I'm not sure if IV works there.) It's not much better in most heroic 5mans...
It's great for a fury warrior, but our killing blow percentage is much greater than prot. I dont see much use for it in protection other than grinding mobs.