Not to bash the idea, but I really wish that they would work on something more ... useful. I mean, when was the last time you were at an exp camp, and saw an EM Malboro that would have made a great pet? These mob types (greater mobs) are usually the stronger hunt in the areas that they're in, so the ability to charm them would be gimmicky, and the use would be ridiculously situational (the only thing I can think of immediate would be using Manticores against Ada in VoS).
Make some high-level jug pets out of them, though ... now you're talkin'.
BST SMN RDM PLD WAR MNK BLM THF DRK(72)