I actually read this after my trip to Malaysia. It's pretty good: I think in broad strokes, it gets most of the important things correct. However, there were a lot of things I learned about on my trip, whether from simple observation, or from talking to locals, that were not covered here, but which should have been covered. It also fails to get the *feel* of the place right.
Malaysia is a tremendously complex place, legacies of British colonialism and the aftermath. While the book does mention the different tribes of people who make this place home, it doesn't mention how they are different. I don't even remember the book mentioning the natives in any detail (he does mention Dayaks, but I was under the impression that there are other tribes). Typical of Westerners, who don't like to talk about such things, he doesn't talk about the social position of the different tribes at all, or the various political upheavals which got them this way. It's a difficult and painful subject, and this dumb American said a few things which violated the local version of political correctness. From my observations: the Malay upper classes own everything. The Chinese effectively run all the businesses (many of which are owned by Malays). The Indians comprise a lot of the manual laboring classes. Vietnamese people (an important group of recent immigrants) work in the factories. Malays are the dominant tribe (as one would expect) make up all levels of society. There were horrific race riots mostly involving resentments against Chinese people, and the insurgency seemed to be funded by China as well. These are huge sore spots still, with Chinese residents.
Stuff I could have used advice on (fortunately given to me by my Malay hosts): dating -basically, don't mess with the Malay girls if you know what's good for you. This might be difficult if you're an athletic westerner: they're very beautiful and very friendly (in a perfectly wholesome manner). I was asked if I was a football player ... countless times. Nope: nerd -I just look like a football player in a t-shirt.
Other stuff missing in action: the way Islamic culture works in this complex society, the relationship to Singapore, and the attitudes of Malay people towards Ang-Mor (Westerners).
Upsides: the section on business relations is excellent.