I'd spend double the money on this mod instead of Shogun 2 b'cause I know for sure it'll be boring after a few weeks, watch their videos interviews and you'll know, same goes for all vanilla total war games exepts maybe rome.
I will definately buy Shogun 2 if and only if they make it completely modable like rome, since that's the only reason I even buy totalwar games anyway: to enjoy the superb mods from the twc modding community, not CA's dev team's half ass works.