Having sandwiches for lunch goes back to the days of sitting in the school cafeteria and eating the crappy luncheon meat sandwich for the 4th time this week.
Let me tell you that Sandwich Box will not conjure up those horrid memories of school sandwiches. With 5-6 choices for bread, spread, meat, vegetables there are basically an infinite combination of choices that you can have. And oh boy are all of the choices so darn good. Everything is so fresh and flavourable that it's almost impossible to go wrong.
One thing that I will warn you is that you need to get there early. Get there before the rush if you want choose your bread. Otherwise you'll be stuck with whatever is left (still good but you're missing out) since things move pretty quickly at lunch time.
And as Phil S. said, I am also concerned about how fast SB is growing. Although sandwiches are a pretty simple formula, it's easy to imagine that as more locations open, the quality will suffer. Let's hope that this doesn't happen to Sandwich Box.