DJK is fine if you're looking for a nice location and a clean, modern Korean restaurant. Their food is overpriced and their side dishes (banchan) are adequate at best. For an order of kalbi, you pay about $28, which is about $5-$7 more than it should be. Other dishes are about 20% higher than other Korean restaurants as well.
For business lunches or if you're looking to introduce Korean food to someone, I would still give DJK some consideration.