Pretty well useless, essentially a list of classes, a few members, and their arguments. The examples are rote rather than illustrative: there's little sense of how a bigger application really hangs together. Qt design philosophy is mentioned (signals/slots interactions) but not explained. The more interesting and complex widgets are only described as views on a database: there may be some really cool MVC design in there, but it sure doesn't come out in this book. Examples are non-compliant with PEP 8 and PEP 20.
A rudimentary introduction into the world of PySide and Qt. I admit, the best way to become a Qt Ninja is to hands-on code some app yourself and google along the way. A book like this one only lists some of the most fundamental Qt features which I quickly read and forget.
Plus the codes show terrible indentation in the epub version. I have to guessed which block the statement is in.