It is really not too bad! Recently got an early edition on ebay. Hardcover, with an imprint (stamping?) of a snorkel covered with Alberich. I thought that was pretty nice!

Anyways, for one thing it is interesting as it lists the side effects of snorkeling for several weeks (mush everywhere!), but it also gives you an idea about the feeling of total helplesness in Germany early after the war.
If it had been published two or three decades later the author would have probably left most of those bitter feelings aside.

If you can get it, read it!

I am currently trying to get all first hand accounts by U-Boat or submarine servicemen. Will try to search this forum for a topic these days. There surely must be one!

Cheers

Kai