The most popular/famous Bánh Mì place in Saigon. You'll have to queue but it moves fast. It's the most expensive one I've had (32,000d) but it also probably had the most meat and it was definitely one of the tastiest. It became one of my regular visits. Recommended.
Note: Don't forget to ask without chilli if you can't handle spice. Sometimes they put it in without asking. I like chilli but I prefer bánh mì without it.