I thank myself for all the searching I did to find a book like this on amazon.com. This is probably the bestselling book devoted to Niagara Falls which is from a well-known travel guide series.
272 pages is without contradiction enough to satisfy me. Even though this book mostly covers the Canada side, that's where most of the tourists go to, not just because of the Horseshoe Falls, but also because of better hotels and more attractions.
As with all regularly updated Frommer's travel guides, it covers all the information necessary, both integral and interesting. These sections include:
Restaurants with their average meal price;
Information on the excessively high Niagara Falls (Canada side) restaurant tax, which many tourists don't realize until they feel the pinch on their wallets when they notice taxes usually add at least 15-20% to the subtotal, what to expect in a prime tourist area;
Tips on money-saving attraction passes, including the widely advertised Adventure Pass;
Maps which are easy to comprehend and are very useful;
History about the region, including the wine region; and
As with all modern-day Frommer's Travel guides, they give you the best of what to do in the region for those who have short trips. I find the one-, two-, and three-day itinerary suggestions very useful, especially because it's a common feature in Frommer's.
Of course all books have disadvantages. This book may not feature an abundant amount of photos, but I do not consider that a significant drawback.
Frommer's main competitor, Fodor's has a guide covering Niagara Falls, but unlike Frommer's, Fodor's does not offer a guide covering solely Niagara Falls. Fodor's tries to make more money by consolidating the two cities in the "Toronto" guide. Fodor's is not aware not all tourists visit exclusively Niagara Falls. Of course there are tourists which exclusively visit Toronto, but I would not recommend Fodor's if you're visiting Canada just for Niagara Falls.
Good luck and happy reading!