I've spent quite a bit of time lately reading this and I have a couple of thoughts about it. First of all, the first half is great. Like mmditter says, there is alot of great facts and it's interesting reading. I think it will help to improve my beers greatly.
However, it is called "Radical Brewing" and the second half is where he gets radical. Anyone who knows me already knows I'm a beer purist. You know, barley, water, yeast, hops. No wheat, fruit, coriander, orange, etc. Maple and/or honey can be ok, as can oatmeal (for stout) but only in very small doses and for a very good reason. Well, not only does he discuss wheat/corn/other adjuncts, but there are pages upon pages of herbals, etc. I'm not interested in chamomile beer- heck, I don't even like herbal tea! Interesting, but really pretty useless for me.
So, the first half is fabulous. The second half I find useless. It is a long book, though, so I'm pretty happy with the quality of information in there. I much prefer "How to Brew".
Lorena