I am probably not very representative, as my main source of information about kdramas has been you! I watched most of Coffee Prince and a small amount of Goong (not really enough to comment on it).

I've picked up zero vocabulary through the experience, unfortunately; I tend to find it easier to grasp words and concepts when reading manhwa.

I'm not Korean--am Anglo-American, actually.

I enjoyed the humor in Coffee Prince, and liked how we got to know each of the characters--including people of different generations--not just the young and beautiful leads. I also loved the relationships between different people in the coffee shop, and how each of them reacts to the big reveal.

I got a little weary of the romantic drama toward the end, but overall, my impression was positive!

It's kind of exciting to see that some kdrama series have become available via RightStuf!