Take a look at his web site for examples. One thing I just hate about most blues books is that they spend so much time on what notes to play, while very little time on how to play those notes. Listen to any SRV song, it doesn't matter which one. Stevie rarely just plays the note by pressing a string at a particular fret. It's these little nuances that make a great blues player.
Blues prides itself on the lack of precision.
In fact, sometimes you never really even play the note. You instead play within microtones of it, hint at it. This book has 50 recorded rhythm tracks with chord charts. But the point is not to jam over them. It really teaches chord substition and other blues rhythm ideas.