hmmm advantages are not too high, but definitively if I wanted to change the game drastically I won't do that... the problem is: can we cumulate these seishin? if so, it's the worst thing to do in toribash...
If you got 10 differents seishins, with different abilities, but you can wear only one, it can be cool (-10 dh it's not too much... seriously...)
I'm mixed.