I haven't got one yet, although aftering viewing some of the Mr. Bento flickr photos, I want to get one and take pictures of what might or might not be a good lunch.
It's a good idea (Mr. Bento, not the photos...necessarily) if your SO packs non-sandwich/frozen lunches. Or if he has no access to a microwave to reheat leftovers. Or if he has issues with different foods touching.
Maybe a Secret Santa will send him one! @:-)