Let me preface this by saying that I love this book as a product. It is very useful for someone who has purchased a great deal of FCom stuff and prefers to have all their rules in one, handy format. The organization is clear, the reference number system is great for cross referencing purposes and means that it is easy for ADB to update the book when necessary without rejiggering the table of contents (which they do regularly). It is one handy book. Unfotunately, What I purchased is not a book; it is a PDF and that is where two major problems raise their heads.
First and most important: there are no bookmarks. This makes it impossible to use the PDF as a quick reference document, especially with games as wonderfully simulationist and crunchy as those produced by ADB. If the material was referenced by page number, it would be slow but not unusable, but the reference number system that makes rules referenceing so useful in a dead tree product (which you can at least add physical tabs or bookmarks to) makes it very difficult to find things in the digital version (which is locked, so you can't even bookmark it yourself).
The major problem with this system is that there are no 'page number' references in the table of contents or index. If I want to find out about the effect of Seeking Weapon Impact, I'm directed to 4F4, but neither the TOC or the index indicate what page 4F4 is on. So I have to resort to skimming through the entire document, doing the equivelent of page flipping back and forth through a 112 page book, to find anything. And if I'm going to do that, I may as well buy the physical book, because that is just plain irritating in a digital format.
And there's the other rub: I paid $15 for the PDF. The book is $14.99. Even given the sales tax addition, selling a PDF for the MSRP of a print product defeats one of the main purposes people buy digital product (the other being quick reference). It is one of the reasons that I haven't purchased any other ADB digital products, despite the fact that I've wanted the Fedcom Tactics Manual since its release, my friends and I would like to get into Star Fleet Battles (we played our first Cadet Book game the other week) and we want to take a run at Federation and Empire (we have an old 1989 copy, but would like to get the digital rulebook for quick reference before diving headlong into a sea of chits and rules).
So, while I love the games and the books, I cannot give this product more than 2 stars. In the PDF market, the lack of a 'digital discount' is not a total deal killer, as some are willing to pay a premium for a really good product, but the lack of searchability in combination with that means that I cannot recommend this product in this format. You'd be better off just buying the print version (which I heartily recommend).
If the bookmark issue were corrected, I could easily revise the rating to 4 stars (unlock the book so I can add them myself and I can push it to 3 at least), but at this point I'm really discouraged from purchasing other digital products from ADB which, in combination with the lack of retail product in my area, really hampers me in selling my group on further expansion into what is really the best, most consistent setting for Star Trek gaming in the industry.