Ever since I came back from the retreat, I have continued to open the many gifts from sustained metta practice. Walking in the world with one's heart open is a wonderful thing. Here is a list of the benefits from loving kindness practice, according to the Mettanisamsa Sutta:
Metta is good for sleep
Metta makes one likable
Metta is good for one's health
Metta is good for concentration
Metta is good for insight
How come it can take years for the mind to surrender to the heart?