Everyone should get this mod, specially for non-tanks that doesnt react fast when they get aggro. This mod is better than the one that come with CTRaid IHMO. In fact, it's good to have both since the one with CTRaid play a sound when you get aggro (but the aggro message on this one is harder to notice).
The mod add a big red AGGRO text when you get aggro and the message stay here until you lose aggro, at this point the message become green and it disapear after 1 second.
Since the message appear on your character, its a lot easier than MT Targets (from CTRaid) to notice when you lose or gain aggro.
It worth a try!
http://ui.worldofwar.net/ui.php?id=1519