I feel I should declare that I'm not a tofu person. Most of the time it's tasteless, and I don't care what anyone says: it's not a good substitute for meat (tastewise)! But if it's tofu from Buk Chang Dong Soon, I will gobble it up like nobody's business.
They have a variety of tofu choices, including seafood and vegetarian. But really, they all taste too similar as the soup base is the same. So when you find one 'topping' that you like, you're most likely going to just stick with it. My fave is the dumpling.
With that said, don't underestimate how good the soup base is. You get to choose how spicy you want: mild, regular or extra spicy. There's no point in getting the mild unless you really can't take the heat. Go with regular even if you are only slightly spice-tolerant; it has much more flavouring. And there's something about their purple rice dipped into the spicy soup that's just so comforting and addictive.
Their bibimbap is also very good. They get the stone hot enough so that the rice at the bottom really crisps up nicely.
As for the service, they are very efficient. They're quick to tend to your needs because the restaurant is always very crowded and they want faster turnovers. However, I've never felt rushed and they've never been rude to me on any of the many occasions that I've been there.
So even if you don't like tofu, give this place a try. You might find yourself liking at least one tofu dish.