I quite like Sandwich Box as a chain. I used to live near the one at Yonge & Eglinton, I worked near the one in the Financial District and, as luck would have it, I go to school near the one on Bay.
Christine R. offers a very helpful overview of how it works.
The salads are always a good option, and because of how you are charged, you always get what you want. Often, though, I go for a sandwich--because there's only so much Subway one can take between classes.
I like the whole grain panini, and my sandwich usually has the following: often grilled chicken, but sometimes roast beef; bocconcini or jalapeno havarti; red peppers or eggplant; with the avocado & chipotle, or basil, or sundried tomato spread. I tend to order some combination of these at any Sandwich Box location.
The Bay St outlet, however, is distinct from the rest. I find that the people there are very stingy with the toppings, and quite careless in spreading them out across the bread. The result is a sandwich that has several bites of just bread with spread on it. They slice the chicken very thinly, which makes for poorer value that I would expect after enjoying the Y&E and Financial District sandwiches. And, I am always a bit weirded out when I see them use a knife to cut my sandwich after cutting someone else's. If I were a vegan--to whom this chain appears actively to target--this would really bother me. As it stands, I simply pay attention to how the knives are being used ahead of me, and ask for a clean knife if I have an allergy concern or anticipate flavour or cross-contamination issues. (I realize that this may sound crazy, and that I might be horrified by what goes on in back-room kitchens, but there's something to be said for 'out of sight, out of mind'... and, anyway, my local Subway outlet tends to be much more careful with knives/cross-contamination than Sandwich Box.)
Overall, I value the variety, but I won't miss the Bay St Sandwich Box when school is done. I'll be happy with the more generous sandwiches and better value at the other Sandwich Box outlets.