I think this textbook was better than my all of popular psychology books recently read. Even though I was advancing slowly, I was not bored at all.
I definitely appreciate the American style in which concepts are explained quite in detail, while the book is quite ambitious and tries to put the basis of many interesting concepts.
The edition I was reading is since the 90s, therefore might be a bit outdated. As an example, I did not agree with the chapter about sleep in which it was stated that we dont need 7-9 hours a sleep and that no permanent damage is incurred if we dont sleep for an extended period, but manage to recover the last sleep afterwards. This contradicts the more recent book of M. Walker, Why we sleep and makes me rather confused. One thing I know for sure, I have much more difficulties in managing my emotions when I do not sleep enough, I cannot focus in doing properly my work, therefore low productivity in everything. As a person that neglected her sleep in my 20s, now I cherish the ability of being able to hearing my own thoughts and wouldn't trade this for anything.