Oh man. My friend Dustin took me here today, and it was awesome. Dustin is quite knowledgeable when it comes to banh mi, and he says that unless you're heading up to Argyle, this is the place to go. Time Out Chicago seems to agree. I have no idea if there are better banh mi to be had in the city, but I tell you what - I'm perfectly happy to eat these.
It's a small place, maybe 3 or 4 tables and a menu consisting of 8 sammiches, some soups, drinks, and bubble tea, but the prices are killer: $3.95/sammich. The sammiches are served on a delicious crusty baguette, and come with pickled carrot and daikon (which aren't as tangy as you might wish, but competent), cucumber (which I declined, because ugh. Cucumber.), cilantro, and then your choice of filling. I went with the Ginger Chicken, and oh man. It was juicy and tender and marvelous, not overwhelmingly ginger, but with a gorgeous ginger vaguely caramel-like sauce. Dustin had the Char Sui Pork, which was equally delicious, chewy, salty, and overall great. I got a vietnamese coffee to go with it, which is always a mistake for me, because my stomach starts complaining before I'm even halfway through it, but what can I say, it's so creamy and decadent.
Overall: awesome. You should go.