Here's the thing, the food is actually pretty good. I'm not from Brooklyn or anything but the sandwiches I've eaten there are certainly tasty.
My biggest tip to you is be aware that as of late, any addition or change to your sandwich costs you extra. Prices of ingredients go up and that's fine... but don't start adding those ingredient and THEN tell me it's going to be extra.
There's a lady there who consistently starts adding cheese or will scoop a big helping of avocado on your sandwich and then say "Oh, that's going to be $1.50 extra, is that ok?"
As long as you're aware... good food.