Well they're slow on the surface, in real life they were either ovens or freezers depending on where you were operating. It takes forever to charge the batteries and while charging, you run on one prop and if your in a hurry, too bad. They had constant problems with the sewage backing up into the ship (they're not called pig boats for nothing) and they are held together with rivets so your crush depth is not so good.
On the good side of things, they dive very fast and they're pretty quick submerged, just not for very long plus I think they look really cool.
In real life, any skipper with any sense would have begged to not get an S Boat but in SH4, they can be kinda fun for a while.
BTW: They only used the MK10 torpedo. It packed less punch than the MK14 but was more reliable.
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