I walked past it randomly while trying to kill time at St Mike's and was really, really pleasantly surprised. I tried the double Pho Burger and it was great! The bread was able to hold the juices while not being too stiff or chewy, and the sprouts & mint tasted great on the burger. The pho broth isn't thick enough to really dip as a jus, but it was nice enough to sip afterwards.
The two guys there (I think one or both were the owners) were really nice and the prices are very reasonable (I think its like $2 for a small fries).