My mother used a belt, doubled, to beat me with, along with slaps on my face
What good did it do? ~ I was afraid to not do as told, never got angry, and tried to be only happy and do as told.
No, I didn't spank my children because I believe it only teaches them that physical force is how to handle issues, and mis-behavior. Ever watch a 4 year old playing with her/his toys if they've been beat? They spank the doll, play violently with toys, act out.
I used time outs, took away toys, then privileges such as tv time, or going outside to play. I also made sure my kids were allowed to have their emotions, to own them and express them without getting slapped.