Really great painting book, lays out all the basics, very explanatory, very readable and offers some interesting insight. I really like his composition section, and his color section. I would say as a reference book it is ideal for students and masters just as a fresh'n up read.
The author is a pretty decent painter as well, sometimes you find them not to be so, but his color is great, and his style is pretty cool, in that it's his own.