I've eaten Vietnamese food all over the valley, and this place is by far my favorite. Particularly the BÚN BÒ HUE ~ Spicy Beef Soup. It is hands-down the best version of this I have ever had. The broth is so flavorful I dream about it. It is incredibly complex and it's hard to pinpoint what flavors are in there, but you won't care, you'll be too busy eating the bathtub sized bowl of heaven.
Also amazing are the grilled meats, especially the shrimp. They have a delicious sauce on them and taste smokey from the grill. Awesome on the rice platter or in the "roll your own" spring rolls (a very light and healthy way to enjoy Vietnamese!)
Also of note are the rice flower crepe (allow a few extra minutes for this one if you are in a lunch rush) and the fantastic creamy curry (chicken, beef, shrimp or tofu). The entree comes with rice, BUT if you order it off the "sandwich" menu, you'll get a smaller portion (the regular is huge) surrounded by warm crusty french bread. To. Die. For. Not spicy but full of flavor and the creamy taste of coconut milk.
They can get pretty busy at times and occasionally the service is a bit slow, waiting to check out etc, but not always and it's worth the wait. Just ask for your check a little early and don't be afraid to flag done a server. They are all VERY friendly.