When I buy a book I first look at the worst reviews. I then look to see if there is any part of the book available online for me to look at, ('look inside' via Amazon, or Google books) and I compare the rational complaints with what I can see. If there are a lot of bad reviews and they seem like rational reviews, then I look for another book.
I like books that have more pages, rather then less, just for the sake of trying to get the most for my money, but it's important that the pages aren't just full of filler or blank space. "Viewing the Constellations with Binoculars" comes in at 518 pages, its only poor review of two stars seems to me to be based on the Kindle version of the book and problems with that format. There are only two reviews, not counting mine.
This book is packed with information. It's divided into two parts. Part one contains information about binoculars, celestial mechanics, suns, nonstellar objects, space and time and preparing for observation sessions. My favourite part explains distances in the universe. This is the best explanation I've read, seen or heard that brings home just how large the spaces are between anything and everything. To be honest, I found all of the first part to be interesting, much of it very interesting to read. I learned a lot in the first part of this book and I'll have to read it again to be sure I pick it all up.
The second part deals with the constellations, where you can find them and what is in them. Most of them have multiple charts, at least one with the lines of the constellation, then the majority have charts of smaller areas of the charts that show one or more spots of interest to someone with binoculars. I would have preferred as many charts as possible had the lines of the constellations drawn in, even if it was just small parts of the lines. It took a while for me to figure out the positions of the smaller area charts in relation to the larger, but I understand this is normal.
The book could be improved with glossy paper (for better pictures) but I don't think it would make that much of a difference for a substantial increase in price. As it was, I got this book at a pretty good price.
I also purchased Norton's Star Atlas and Reference Handbook (19th ed) which has 16 good quality maps of a decent size. I also downloaded the free planetarium software Stellarium which is excellent for seeing whats going to be where at what time and date.