It's a very compact book and deals (inevitably) with only a fraction of the species you may encounter but, as a straightforward field guide it is brief and clear without dumbing down the information it presents. A more academic guide might use drawings rather than photos but the pictures in this generally give a good impression of the animals in their typical environment.
One small quibble is that it shows some inconsistency in its quantifying of the venom threat in the snakes. It is not always clear whether a snake is not venomous at all or merely not particularly harmful. As far as I can tell, all those that are seriously dangerous are clearly indicated, though.