It's been a few years since I used Poser, and when I recently restarted I upgraded to Poser 8 and thought this book would help me get to grips with it again.
If anything, it made me realise that very little has changed in how Poser is actually operated.
Really, if you have any experience with previous versions of Poser, you'll work P8 out for yourself, and while this book does have a few (a few) good tips, you'll find you're mostly reading stuff that you already know - And frankly, given the exorbitant price of this book, you'll be paying a LOT for just a few tips.
On the other hand, if you are completely new to Poser then I can recommend this book with hardly any reservations (other than the price). It will teach you a lot. On the other hand, you could join one of the Poser-friendly forums (such as Renderosity) and pick up all the info you need for nothing.