This book comes out everytime I brew and everytime i'm given things to think about and put it down feeling inspired. As others have said the layout is slightly erratic but worth bearing with and you get used to it.
The best thing about the book though is that it serves as a yardstick or that intial stab in the dark for an adventurous style or recipe so that you don't go far wrong. Good old Randy will have commentary that mixes the history, logic and reasoning as to how the style came about then will follow it with an example of a personal recipe for that style so you can see what goes in it to what ratio's, a rough original gravity and mashing and fermenting temperatures aswell as hop schedule. I usually use this book alongside Clone Brews to help me build up a general feel for the style before doing something in the same vein of my own.
Another good thing about it is it serves, as the title "Radical Brewing" suggests to aid that side of me where i'll get an idea along the lines of "I think a wheat beer with thyme could be good" but don't have any idea if it is REALLY is a good idea, on the quantity needed or method of acheiving it if it is. It has good clear tables for adjunct grains, different sugars, honeys, fruits, vegetables, spices and seasonings and what character each has and how to utilise it.
The annoying thing (as with a lot of brewing books it seems) is that because its American you have to convert there liquid measures into proper british gallons, and some of the ingredients are hard to get hold of over here or have different names. But this is a small hinderance and after only having this book about 10 months I couldn't imagine brewing without it. It feels like a printed version of a good tutor at university that will pull you back and make you think properly about what you're doing, and give you that crucial bit of information so you can actually go and make a good job of it.