I don't know... I don't think their pho is just that great. The flavour of the broth isn't strong or pungent like other places I've been to. Their bun bo hue is also very inconsistent - some days, it's spicy others, it just taste like shrimp paste out of the jar.
I don't find the staff here very nice either. I mean, I'm not expecting you to be forcefully nice to us but a smile goes a long way.