My daughter, a high school senior who agrees with her friends that the school lunches "suck," is sold on this. She wanted to lose a few pounds, which this has helped her do despite the fact that she now eats a higher volume of food during lunch.
How? She, like all her friends, used to skip lunch and leave school famished, scarfing down the first things she could get her hands on - usually high fat, high calorie junk food. This lunch box has eliminated her after-school munchies, keeping her appetite in check all day long. For the first time, she can pack hot (or cold) nutritious lunches at 6:30am, and they are still piping hot (or ice cold) when she pulls it out of her locker at 11:30. Her friends, who good-naturedly mocked her "space capsule" lunch at first, now crowd around her during lunch with their tongues hanging out, jockeying in line for her scraps. One remarked: "Your lunch container is about the same size as my water bottle, but you've got, like, a 4-course gourmet meal in there."
She's lost 10 pounds in the 2 months since she started taking her lunch in the Zojirushi jar, has gained noteriety among peers for having the "best lunches ever," has become more good-natured and less surly (better nutrition), and dances in her seat during 4th period as she waits for the bell to signal lunch period, where she can spread out her containers before her envious yet admiring friends and hold court over her "gourmet surprise" meal, trying to decide what to eat first. By her own admission, she has more energy and better concentration in class and during studies (her grades are up, by the way). She admits it's a pain to have yet one more thing to carry around in addition to her backpack (not that it wouldn't fit, but the backpack is already stuffed tight with books), but swears the payoff makes it worth the minor trouble. As a parent, it tickles me to see this self-described "laziest person on earth" hunkered over the sink at nights, lovingly and painstakingly cleaning out every container and lid (no doubt thinking ahead to the delicious and wholesome treats it will contain tomorrow).
Such a good buy, I bought another Zojirushi model better suited for my 11-year-old daughter. My kids say they will never go back to school cafeteria lunches, and have become much more nutritionally aware and involved in meal preparation. While their friends waste half their lunch period standing in line for tasteless and overprocessed entrees laden with salt, refined sugar and carbs, my kids dine on veggie chili and hot cornbread w/butter, delicious main course salads with homemade dressing, pita sandwiches and hummus, and stir fried teriyaki veggies over whole grain rice. And that's just the bottom 2 containers! The top 2 containers are perfect for fruit, tortilla chips, nuts and/or healthy desserts, all items middle and high schoolers love to eat. I'm thrilled with the product, which is solidly constructed, and which works completely as advertisied, with even better results if you preheat or pre-cool containers for 5-10 mins. We replaced the chopsticks with a plastic cutlery set, which fits nicely upright in the cloth carrier, thanks to the stretch loop on the inside.
NOTE: Like the other reviewer, I too was mildly annoyed at the Japanese-only user documentation, but then called the company at their California office (800-733-6270) and they promptly mailed/faxed English instructions. Don't even get me started on the money this saves by eliminating costly meals out and packaged foods. Excellent, excellent buy that has already paid for itself tenfold.