If i recall propely, the requirements of this feat are 21st level, 21+ base Charisma, 21+ base Wisdom and Turn Undead.
This is one of those feats that, sadly, don't get much use due to their major requirements, and i think that perhaps it could have a look so it's made a bit more accessible, since as it is now, no Clerics nor Paladins seem a bit keen on aiming for it, unless the character build is specially designed for it, but even then i don't think it's worth for the single purpose of taking it... please do correct me if i'm wrong, though.
What i would suggest would be... either lower one of the ability requirements, or totally remove it, but increase the other reasonably, like to 25 or even 26. Making it require Charisma OR Wisdom would work aswell, but then again the required score would need to be upped, like 27 or even 28 of said ability.
Either way, discussing this would be nice, feel free to comment as always.

The departure of Xandrial actually did remind me of this feat, hehe.