The main point in Weber's *The Protestant ethic and the spirit of capitalism* is that the Protestant ethic helped to shape values favorable to the birth of capitalism. Despite that, the author isn't a cultural determinist because he takes care to point out that values help to shape an outcome, but don't produce it for certain.
This book is quite interesting, and includes lots of interesting observations regarding Weber's main premise, despite not being overly long. For instance, the author says that due to the fact that Protestant ethic viewed hard work as a duty and looked down on excesive luxuries, Protestants were indirectly encouraged to save almost all the money they earnt, thus increasing the funds available for the capitalist process. Of course, there are many more examples that contribute to give weight to Weber's argument, but to know more you will need to read *The protestant ethic and the spirit of capitalism* ...
Weber analyses some data at his disposal, and that makes some chapters slightly less engaging. Notwithstanding that, this book is likely to be worth your time and your money. To start with, you will learn quite a few interesting facts you probably were unaware of before. Secondly, and in a more frivolous vein, you will finally know what everybody is talking about when they mention directly or indirectly this book from time to time :)
All in all, I recommend this book to those interested in Sociology or Cultural Studies, but also to curious people who want to know more about the influence of culture in different processes. Enjoy it !