Went here on a Sunday after church for lunch, and it was not busy at all. It was my first time here, and I really enjoyed what I got. I got a tofu roll appetizer with broken rice, and also had some beef pho.
The tofu roll comes with dipping sauces on the side (either a soy type sauce or peanut sauce; I got both), and it is probably one of the best things I've ever eaten, and is going to be the thing I will come back to Pho Bosa for. The pho was standard but still very good. I also really like that they have a bottle of that Vietnamese fish sauce on every table.
Overall, very good Vietnamese food, and I highly recommend!