I've read it - it's the basic introduction to the ROSS system; fundamental principles, basic movements and so on.
If you want an introduction to Russian martial arts, it's good; unlike a lot of such books, the illustrations are *very* clear - good line drawings, not murky photos - and I found it to be very understandable (although take that opinion for what it's worth: I already had a fair bit of experience in the style

).
You'll see some basic applications and be given enough information to develop some more, or if you're already a martial artist, perhaps to look for improvements in form or efficiency in what you already do.
The book is only worth what you do with it; I wouldn't rate any martial arts books on literary content. If you can put it into practice, either in a class or with a training partner, it's definitely worth the price - and $12.50 doesn't seem that much, by martial arts books standards.
I am a ROSS instructor, by the way, but European and so totally financially unconnected with AARMACS/AMERROSS - it's not just a sales pitch!