Has anyone gotten any use out of it yet?

I haven't seen the knockdown effect of it yet, but of the few matches I got to play on DRK it was extremely satisfying to see some people who didn't pay attention absolutely melt their own HP attacking me. Seeing a BRD crit himself for over 350~400 off his own attacks was hilarious. Getting random kills out of no-where was great.

I've heard it stacks with Bloodbath too (I would assume so, since Vengeance does as well) and I would imagine Blood Weapon would be nice with it (hello MORE MP regen for people attacking me).

Couple of things I've been curious about-
How often can the reflect proc? I don't really notice it much when I use it, I see it here and there but not super often; generally only stands out if I see someone take a crit from it. Is there a tiny cooldown between hits or something, or is it like Vengeance where EVERY physical hit is a guaranteed reflect?

Does Sword Oath trigger a double reflect? If it does I'll have to be far more conscious of what I'm doing if I ever play PLD in PvP again.
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All in all I can safely say I love this skill already. I wonder how the knockdown works.