I read the book recently, not a masterpiece but yes it is interesting to see the whole thing from the other side.
I am reading Iron Coffin now while playing SHIII and it is funny to see the difference between the two, how the escorts, destroyers etc thought the U boats were like predators trying to hunt the flock of hapless sheeps they are trying to protect and how it was unfair and disheartening to see them sunk one after the other.
The U boats captains on the other hand like Werner in his book thought they were getting persecuted. He uses this word a lot and it is kinda ironic when you think about it because basically they were trying to sunk helpless ships, well in the begining at least.
I thought the name of the first ship was a bit silly though, it was the Compass Rose or something i think.