With respect to the temperature:
I have even used a few times for food (using it regularly for tea, which really guard long hot!). If the procedure complies to put in boiling water for a moment of heat through his food to the pan and not to open before consuming it holds no worries from morning until noon, with a temperature hot and not lukewarm as most low end thermos (plastic bento or gender. I am a student and we have no microwave in school, so many people have this kind of thermos, and I could compare ...)
Other points:
The product arrived in a simple little card, dumpy and who does not think of a product "high end" as is. Thermos could make an effort at the packaging.
In terms of strength, it seems very sturdy. The only point that I think can be a weakness is the inner plastic cap (the one with the spoon, which is also handy). The exterior is made of steel, no trouble to do on that side. As against this plastic stopper, even if it is solid, perhaps not last for decades? appointment in 20 years ... And above all, what seems to me the most risky is the joint that is on the same sealing cap. I do not know if there are other methods, but this is perhaps his biggest weakness.
So a quality product, albeit a bit pricey, but that keeps its promises! I recommend it!