It didn't revolutionize the way I study, but it was nevertheless a good book. After all, why did it and the studying techniques in general have to be something sophisticated? (They can be it, but apparently even the simple ones work equally well.) If one reads it with the aptitude of not expecting to find something extraordinary at every paragraph (though there have been, at least for me, a few but not more, basic interesting facts) then I believe it will be possible to gain more from this book and make a good difference on one's own studying efficiency. The difference may not be colossal, but good enough to be worth the effort. (Once again, personal perspective here.)
That being said, I do not exclude the possibility of finding a more detailed, in-depth and interesting book on the same topic, yet this one was not all that bad, and so I do not consider the time needed for reading it wasted.