I'm honestly surprised to see this on Massdrop, and I think it's good to give a bit of a review on these. I purchased 2 sets of these over the years, and have had mine for about 10 or so years now.
The build quality is quite good. There's a main holder of sorts, that holds 4 containers. The idea behind the thermos is that it's more insulated at the bottom than the top, with an insulation layer between the bottom and the top. This is largely with the "large container" (2nd from bottom) where it has a fairly thick piece of styrofoam in the lid. Meaning, that if you have warm/hot food, it should stay warm by the time lunch rolls around, but the top two cups won't be as warm (and the very top is largely unheated). Each container seals quite well, and there's not much, if any leaking. Also since there's an outer shell - even if an individual cup does leak, the likelihood of it getting out of the outer container is minimal.
This setup can hold warm, or cold foods. Personally, I'd recommend only doing warm in this though. A common meal for myself (I work from home a lot now, so maybe not as often) is the following:
Lowest Cup - Warm Miso
2nd Lowest Cup - Rice, plain
2nd Highest Cup - Veggies/protein (goes on rice)
Highest Cup - Fruit and/or some kinda desert or nuts.
When I was using this every day, I'd prepare my meals in the morning. A rice cooker, set to start before I got up had the rice done by the time I got up. Frozen veggies, left overs, etc would be added to the 3rd highest cup. Miso is very quick to make, I have a hot water warmer I also have ready before I wake up. That, plus some miso, and a bit of microwave = decent miso. So 3 of the cups can be prepared fairly quick. Desert is usually prepared the night before. All of it stored in this, thrown in my backpack with either chopsticks or a fork in the side, and off to work.
It's also worth noting that this is much larger than one may expect. The dimensions should be available, and I'd get out a ruler and measure everything. Reasoning being is that this may or may not fit in your commute bag. There are many other bento-box like setups, some that are cheaper and smaller. The main area this one succeeds at is that it can keep your food quite warm/hot til lunch. If you're aiming for food that's more cold that you can microwave at work, then I'd look toward other solutions. It's not so much that this can't do it, but there are other solutions that include ice packs that you can add to an insulated bag to keep things cold. I have one of these, too, but I don't use it nearly as much as the Zojirushi. Also note that this thing holds a lot of food. Easily enough to have a snack or two in combination with a meal for lunch.
Personally, I really think the Zojirushi is fantastic for my use purposes. I bought mine awhile back, but it doesn't appear the design changed much. If you're into bentos, especially warm Bentos and don't mind carrying a bit extra, this could definitely fit your needs.