This work is really intended as a modeler book and I would say that it is one of the best that I've seen in that regards. Many pictures, many 3-D shadowed drawings showing all mounts from different angles.
Several errors may be found, including bore size of the Panzerschiffes' main armament and number of 40,6 cm guns built. Amusingly, the author claims that the 28 cm guns on the Panzerschiffes and those on the Scharnhorst class were the same except for bore size yet there are tables in the work that quite clearly show that the guns actually had exactly the same bore size but had significantly different lengths and weights. I would suspect that the tables were an editing change for the English version, as they seem suspiciously similar to those found in Whitley. Surprisingly for a book claiming to list all German naval guns of the WWII period, it does not account for the 28 cm and 17 cm guns that were on the two old battleships still in service during World War II. Seeing how one of these ships fired the first naval warshots of the war, it seems a odd omission.
This is a translation of a Polish work that was published in four parts between 2004 and 2010. I would guess that the translations are what held up the English versions. My copy is a NIP work, it is also published in Britain by Seaforth.