It took me less than a night to read Brew Chem 101, and I a total newbie to brewing (although I do know biochemistry OK). I got nothing new out of it.
I am reading Fix's book right now, and am finding it much more informative. If you can only get one of the two, make it Fix's.
Briggs' looks a little expensive for my pocket right now (and I don't plan on getting Kindle either).