IMHO definitely the best Vietnamese Subs in town. My favourite is the sate chicken sub. The bread is perfectly toasted. This place is consistent time after time. The flavours with the pickled vegetables is a perfect balance.
It is hugely popular, especially during the lunch hour. The long line-up all the way down the sidewalk is a good indication of that. The husband-wife team are not the most efficient... but the quality of the product speaks for itself and is worth the wait. Even in the middle of winter when it's -5 outside, you will still see a lineup down the sidewalk.
I now sometimes go to their sister-location on 8th Ave around 6St SW if I don't have enough time to wait. Their sister-location is pretty close to the "real" thing although I'm still convinced that the bread is toasted more to perfection at the original location in Chinatown. The sister-location on 8th is run a lot more efficiently by a younger team. They run it more like a subway shop and even if their is a line-up out the door, it moves fairly quickly. At the Chinatown location, I've waited as long as 45mins to an hour for a sub during the peak times.