I bought the author's original guide several years ago and found it most useful and informative. The park is huge and the book is geared to the vast majority of the public who experience the park along the highway corridor. I had to laugh at the reviewer who is disappointed that the book reveals no "secrets," for obvious reasons - how secret would they be in a widely distributed publication? More accurately though, the many observations and suggestions for viewing wildlife and choosing camping areas ARE the "secrets" since most people won't read the book.
Alas, many people do read the book which can make for crowded places. For instance, I frequent a certain spot in the fall when I visit the park to see moose. This spot rarely disappoints. Years ago only a handful of people, if that, would be around at dawn. But the last couple of years it's been like a Walmart parking lot! But it doesn't seem to spook the moose who still frequently show up. I've also seen wolves 3 times in 4 trips two of which were at spots the author suggested.
In the last 3 years I've acquired the birding bug. I've found the author's suggestions to be provident. Unlike the moose spots, the birding spots are sometimes in areas where park visitors rarely tread. I'm usually out there alone and finding great birds!
In short, the book is very good. It helps the visitor get an enhanced Algonquin experience whether seeking wildlife or choosing a campground or hiking trail. I recommend it to anyone who wants to know more about this incredible park.