I got this at Christmas, and have just finished it five months later, which gives you an idea of how motivated I was to keep reading it! Not that it's bad - it had many interesting parts, and definitely got better as it went on. I just found that for the most part, the main objective of the book was an exposition of psychiatry and psychoanalysis around the beginning of the 20th century, with a novel tacked on the side. Really, to hold the reader's interest, it should have been the other way round - the novel, with its characters, themes, narrative to the foreground, and to explore the medical themes within that framework.
As it was, I found the characters dull and flat, and the narrative drive non existent - for much of the book, there was no drama, no conflict - everyone's lives went by without anything particularly interesting happening apart from medical lectures and patient examinations, much of which I have to admit I found just far too technical to really want to read.
A shame, because it is obviously very well written, and the good bits really held my attention. By far the best section of the book was Thomas's visit to Africa, which was interesting both in terms of what would happen and whether the expedition would make it back safely, and in the discovery of the footprints and Thomas's subsequent discourse on our ancestors and the voices they heard, which was both amazingly thought-provoking and incredibly moving. Daniel's experiences in the war were also a highlight - as was Thomas's announcement to the family that he has Alzheimer's, which was the most moving part of the book.
So in summary - all the bits in lecture halls or consulting rooms: too technical. All the bits about the idyllic life in the schloss: too boring. Everything else: great!