How was your experience teaching English in Korea?

I worked in Daegu for one year, for a hagwon, teaching children. Most my friends were hagwon teachers. I then lived on Jeju for six months where I was not teaching, but all my friends were teachers, most of them EPIK. For your questions…

Do you think government regulated programs are the better choice? For me, the private school was the way to go because it offered a higher starting salary and less hours. I also liked that I worked in the afternoon / evening. Government schools offer stability and guaranteed holiday. If you are going to stay multiple years, the salary increases too.
Were you treated well? Yes, very. Try to get in contact with past / current teachers of schools that you apply to in order to find out what they are like to work for.
Were you teaching/living in an urban or rural location? Daegu is urban and the foreigners in the city seem to have a large drinking culture. I didn’t like the city much, but was much happier when I lived in Seogwipo on Jeju. There are mountains and the sea to enjoy, so there is lots to do outside.
What do you wish you had known before coming to Korea (or other country)? To live on Jeju.
Did you find teaching children or adults more fulfilling? Both can be fun, but I prefer teaching kids, especially the little ones (although it is mentally tiring).
Were you able to save a decent amount (relative) to pursue further travel excursions? Yes. With free flights, free house, low tax, and one a month salary bonus at the end of the contract, Korea offers great opportunities to save.

I hope that this helps a little bit.