Moon guides are in general well researched, balanced, informative and truly valuable travel companions. Northern California, for example is quite excellent.
This "new" edition of the Philippines Handbook, published in late 1999, is, however, a sharp contrast to Moon's normal standards.
Sloppily edited and badly out of date its errors are too numerous to mention, the accomodation sections being especially unreliable. I checked out accomodation comments for several cities which I personally know well including Manila and Cebu and the data in this book are either very out of date, very incomplete, or just plain wrong. Information on shopping in both Manila and Cebu is similarly outdated or just plain absent.
No travel guide, unfortunately, takes this interesting, challenging and rapidly developing country seriously. The "new" (1977) Lonely Planet guide is little better than the Moon guide
In summary, if you have an older edition of either guide, use it. These "new" editions are a sham.