The four nesting layers of these lunch pails were inspired by an Asian design of stackable lunchboxes. They are made of food-grad stainless steel, and are a very adult way to take your lunch to work.
The advantages to such a lunch box are mostly that the things in each container are kept separate and that the containers can be joined together and carried as one unit. While you could achieve the same type of separation with Tupperware, you won't end up with the same easy-to-carry stack. If you're not taking a lunch, the containers can be used for snacks, like M&Ms, nuts or dried fruits to get you through a long after noon. On top of that, the design is simply beautiful. The disadvantages are that you'll have to find things that fit in the boxes, so sandwiches might be out, considering each layer is 5-1/4" in diameter and 2" deep. The boxes are also not insulated, so they will have to be refrigerated if you are carrying anything that cannot be stored at room temperature. Whether the bad outweighs the good is up to you, but it's definitely a better choice if you tend to take salads and leftovers for lunch, rather than chips and sandwiches.