Books like this caused me a lot of troubles. When I began to read Schiff,Messiah and the like I did not understand anything because I was convincedthe (semi)classical description given by the intro books on QM wasessentially right. Thanks to Cohen-Tannoudji (mainly) I discovered I learntvery little from them and I was under the impression that I knew the Physicsbehind QM. Now, I'm enjoying Schiff and Messiah. I find the book somewhatchaotic and verbose, and a chapter devoted to the Bohr's model of the atomseems too much -- this model is easy to grasp, indeed, but definitely false,as it's known since almost a century ago. BTW, if you can read English,don't buy the Spanish translation -- it's the worse I ever seen.