It is a fast read and takes about an hour. I give it a four because it is a work that asked this man to relive a galling experience that out of 135 people he is the only one to recount the tale. Of the four suvivors out of the original 135 in the water after the sinking, one was executed, two vanished into history and only he was left.
As a literary work, it is not comparable to modern tales of survival as it lacks the depth of detail one now expects from autobiographical accounts. The reader also has to accept the writing with a certain realization that it was done so in the 50's from the cultural, national, and ethnic norms of pre-second world war generations.
Still, If you consider tgat 135 people have been lost to history during war, this is at least a testament to what happened and a way to keep some of their memories alive albiet in a slanted way.