I read this book 'to know my enemy' mainly to destroy the arguments used by my old postmodernist college teacher. As you may have figured out I originally stood in complete opposition to this book, rallying behind the likes of Alan Sokal and Richard Dawkins.
However, after reading Thomas S. Kuhn's: "The structure of scientific revolutions" on paradigm theory (read this first), I felt I had to study Feyerabend's take. After doing this, I can at least concede that I have taken on board some of his relativist criticisms albeit I have done so with a large pinch/grain of salt. I am still by no means a postmodernist and as usual I stay close by to my copy of "beyond the hoax".
A quick word of warning about most pre-postmodernist "dada" or any postmodernist literature, it can be very wordy at times, so to those very lost lay-men out there...watch out! I think that with a good head on your shoulders you should be able manage it while it coincides with your A levels.
Also be very careful when reading this book, always approach it with a skeptical mind because it is very tempting to fall for 'woo' when it is written so well. If you feel you are falling for empty rhetoric return to your Sokal immediately.