Good Korean food in SF is sparse, IMHO. This restaurant is in a unique spot since there isnt much in the way of competition nearby. They food is fresh, tasty, reasonably priced, and authentic. It has a sizable menu, and can accomodate larger groups. We usually eat the staples (Bul Go Gi for example) and the vegetable sides are fantastic. Can you find better korean in San Jose or L.A.? Sure you can. But for inner city dining, this place is fine.
Came here last night with 4 other friends. Was seated immediately. Ordered the following: chap chae, bulgogi, marinated chicken, kalbi, and the seafood pancake. It was more than enough food for the 5 of us. The food was flavorful and portions were sized appropriately. Came out to $21 per person after tax and tip - just a tad pricey.
Cha Cha Cha's is a great place to go on the weekends. It can get pretty crazy busy, but for the most part you can sit at the bar if you can spot a group about to leave. The sangria rocks, the tapas are pretty good, but at times the service is lacking.