In SH3 the IXD2 has one major allure, and that is its fuel capacity. Can cruise ANYWHERE, and not have to be overly concerned with fuel consumption. Maximizing submerge time in order to save fuel sometimes gets really oldwith me, but often i have no choice if i expect to make it back to base. A hit in the fuel tanks in my opinion, is tantamount to death sentence if at 100% realism and/or no nearby milk cow avialable.
My only beef with it, is its a really large target.
(after having been DC'ed and forced to surface, subsquently rammed by attacking DD, )