I work in the area and come here maybe once a month when I have a pho craving and need a place near work. The decor is relaxing, and the music is pleasant. I find service to be fast which is really important during lunch.
On one side, the prices are a little on the high side, and the pho is somewhat bland. On the other side, a lot of my American coworkers won't go to a mom and pop pho house. Pho Dalat is somewhere they would be okay with.
If you're on that side of town.. have a pho craving.. then Pho Dalat will definitely cure that.. but don't get expected to be wow'ed by the complex flavors of the broth