But how many have thought of using this while raiding at level 100?
Think about it, if you combine that proc, with for example...any healing CDs. You will have quite alot of extra shielding.
And since you can change weapons while in combat, you can change back to your main weapon after you've used the proc with a big healing CD.
A guildy of mine tried this out, and he said it worked wonders. I haven't tried it myself yet, so I can't say for sure, so as for now this is unconfirmed, but it most definately should work!
Edit: This could work for PvP aswell!