Well i thinks its not worth buying makeit ur self. And i agree that DRK should use dex+ then mp but remember DRK hits more than ur magic spells most of the times.
This actually looks like it would be half decent for DRK. The extra MP would allow for an extra cast of Aspir if needed, and the extra HP would help when Last Resort or Souleater are up. Sure its not a huge difference, but at a lot level it's better than nothing.
Good for a DRK or a DRG/mage. Prior to 50 you have 2 choices, a Dex bonus Grip or this one. With the Accuracy mod to Two Handed weapons, this can do nicely.