Meditators of loving-kindness receive specific benefits. The Buddha enumerated eleven:
"I will teach you eleven benefits. What are the eleven benefits? They sleep comfortably and wake up comfortably. They will not have un-virtuous dreams. People adore them. Nonhuman beings adore them. Gods protect them. They will not be harmed by fire, poison, or weapons. Their minds will always be joyful. Their faces will be clear. Their minds will be at peace when they die. They will be reborn in celestial realms because of their mindfulness [of morality]."
Source: The Heart of Unconditional Love
The Heart of Unconditional Love