Ah sorry my bad. Didn't know about the change since I never had one on live / never played a class with the spell.
On another note, the aggro from the proc seems low. Perhaps it is currently working as intended, but I have talked to various people who say it's supposed to be very good aggro. There's a post on zam mentioning it as well
http://everquest.allakhazam.com/db/item.html?item=343
I've been testing the aggro on the spell and have had an instance where a monk proc'd stun at the start of a fight and I had a lucky 3x streak of procs, yet did not pull aggro.
Just figured I'd mention this in case the spell is actually generating lower aggro than it should be.