Bento Boxes of which this is one, are used by millions everyday. At least here in Japan where I live. The beauty of the divisions is that you are more likely to eat a varied lunch which is always better than single items. Also you are more likely to add vegetables to your lunch, again a good thing. Third, leftovers can be used in a way that does not make you feel you are eating last night's dinner again, i.e. use a bit of each of a few days' leftovers.

Anyway, it is a pain to pack and wash, but it certainly provides the setting for a more complete and healthier lunch.

I would say go for it.

Mike