Damn you guys are picky
This is a great little proc, I still use it consistently at lvl 80, and is part of my buffage spell set. The only time I don't have an extra buff slot available is when I'm raiding, so it doesn't really matter if it wastes one.
It's great for soloing and duoing, a little extra damage never hurt because we are NOT A DPS CLASS! Just because this doesn't proc twenty times a fight with 450 damage doesn't render it useless! You are already a pally and can do a TON of things, so don't fret about not having oobahlicious dps, you rawk enough on the battlefield. Plus, ~you all know this has happened to you~, when you duo with a rogue or that warrior who thinks that just because he's a warrior he can tank better than you, then you have a little extra aggro going on.
So quit ********* I personally love this spell, it does nothing to me besides take away a mere 155 mana, and gives me an extra little dps and aggro.