I frequently use Swanson's Chicken broth when I'm out of homemade for soup. I also use it in all sorts of different recipes, & also just as a nice cup of broth to enjoy on a cold afternoon instead of tea. I LOVE the cartons for their convenience. I just mark on the carton when I opened it, & if I haven't used it up within 14 days, I either freeze what's left or, if it's just a tiny bit, add it to the dogs' food.
Although I haven't tried it yet, the other day one of our local markets had cartons of "Mushroom Broth", which I think would be VERY interesting to experiment with. I've made my own mushroom broth several times for vegetarian vegetable soups, but I still plan on trying the carton to see how it compares.