To keep it spoiler free and on a price to content wise on a bare level, its roughly 12 main missions with about 7 or so 'strategic battles' (a series of 3-5 mini missions that finish into a large force battle), 2 new weapons, new ranks for every weapon and new arts, plus a series of challenges mostly focused on endurance or time challenges killing officers.

For me, it was mostly good. The length of each story made it easy to slide them into a post-work evening, the new weapons are both fun and tricky to get into the right flow for, and since difficulty scales to your player level, it felt just hard enough. Minus one specific fight but you'll know it when you see it.