Generally speaking, those VSIs written specifically for this series are livelier, more recent, more engaging and more in keeping with its spirit. Cunliffe's The Celts (2003) illustrates this distinction well.
The author is an expert on Celtic civilisation and well-placed, therefore, to separate myth from reality. The myth has a surprisingly long history. Plato, writing in the 4th century BC, was the first in a long line to characterise the Celts as warlike and drunken. Strabo thought 'the whole race ... war-mad' while Diodorus enjoyed Roman merchants' exploitation of the Celts' perceived love of alcohol: 'for one amphora of wine they got a slave - a servant in return for a drink!' All excellent propaganda and amusement for a Graeco-Roman audience, of course.
Cunliffe, however, presents a culture which is in many ways parallel, not inferior, to those of the Mediterranean. The Late Bronze Age warrior-aristocracy of northern Europe, with its rituals of hospitality, gift-exchange and obligation, was 'not at all unlike the kind of society depicted in the works of Homer.' Celtic cultures had their bards and an oral tradition to rival the Homeric sagas. Julius Caesar, for one, was notably impressed by tremendous feats of memory, and Cunliffe notes the almost miraculous continuity of this oral tradition, persisting (in Ireland, at least) well into the twentieth century.
This VSI is careful to avoid the kind of over-simplification that can lead to romanticising. Cunliffe is quite clear that the term 'Celtic' is largely a modern construct and, as such, to be treated with caution. The various 'Celtic' tribes, spanning modern Portugal in the west, Hungary and Romania in the east, and Scotland and Ireland in the north, probably had little or no sense of collective identity. They may well also have spoken mutually unintelligible languages.
This is a clear and concise addition to an excellent series. It is enjoyable and expertly written with the non-expert always in mind.