A primary contributor to the success of the Banh Mi is the intercultural marriage of the outer French baguette and inner Vietnamese contents. What your tongue first meets is the bread, and that first impression better sweeps off your feet. Okay, maybe not your feet, but my feet, since I've been eating Banh Mi's at least weekly for the last thirty years of my life.
So the bread at Mr. Sandwich is decent, nothing for me to fall heads over heels. It's all a bit too soft, not crusty enough. However the contents are delicious. The combination (Dac Biet) gives you quite a bit of cold cuts and their accompanying pickled cabbage and carrots are cut of thicker size, which is how I prefer it. They also offer the omelet (Op La) which is the egg banh mi, not offered in most places (Hue Thai is the only other place I've had it in Vegas).
Prices are average, I've seen less and more expensive in Vegas. So for their sake, I hope they improve the quality on their baguette before Lee's Sandwich opens up down the road.