Hehe...
I actually used these in a 1-shot adventure I GM'd for the North Carolina Game Day IV. IIRC, they were blunt arrows imbued with CLW at 5th level. I allowed them to be used as a range touch attack to deliver the spell. They were carried by a ranger/cleric played by one of my old players from the NC area.
He kind of laughed at them (he thought they were silly), but they proved to be immensely helpful since they saved 2 party members that were down and dying when no one could get to them to administer potions or other curratives. The scenario did not contain any undead, but I would have allowed them to be used against undead in the same manner (ie, ranged touch attack to trigger the spell).
~ Old One