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I've never used them directly as-is, but I have used them as receptacles containing a copy of the memories of slain heroes. My last campaign had a warforged NPC, Pinwhistle, who was the memory-construct of a slain gnome cleric. (It helps to have archmages as friends!) The archmage got a copy of his deceased friend, the gnomish memory-construct enjoyed being in a tough, powerful body, and the original gnome cleric got to go to his just rewards after his natural death. Everybody wins!