So my background is that I did the first level of the program the summer before graduate school. Now that I'm wrapping up, I want to go back and finish the program completely through Boren. I had a really good experience there and had a great group of friends (a lot of Japanese actually who we all spoke Korean to each other). Some of the teachers I had were really good and some were just plain bad. I'm Korean American so I'm comfortable speaking the language but not so much on professional or business Korean which is what I'm hoping to focus on heading back there. Private message me and lets talk about it some more.
I actually have a classmate here who did Sogang University this past summer if you want, I can connect you to him. From what I heard about Sogang, its really good for speaking and developing fluency.