Got my copy a week ago and its great. Its nice to see a poker book that presents some genuinely new ideas and ways of thinking about the game. Thanks to Matt, Sunny and Ed.
By the way, I found a nice little application of the spr idea to semibluffing on the flop. Its explained in this thread
http://forumserver.twoplustwo.com/showfl...=0#Post11791114
As a simple example, say you have a 8/9 out draw on the flop and your single opponent makes a pot sized bet into you. If you think the he will fold more than (spr-1)/(spr+5) of the time then an all in reraise is better than folding.