I only bought this book because I'd stumbled across the website of the author (from the site of someone I know) and you might want to go there to see if you like her writing style or not (the Amazon review rules stop me putting the url in - for some reason - but it contains the words 'bookgirl' and 'org'). It was my enjoyment of the site that led me to the book. I don't think I'd have been interested otherwise - I am mistrustful of books with brightly coloured covers and the title and quotes about zeitgeist gave me the impression of an empty piece vaguely (and not interestingly) about 'contemporary relationships'.
I'm saying all this because I was very very wrong. Yes, it's about a group of young people in contemporary Britain; yes, there are lots of cultural references which may not age well (bad news if you're planning to read this book in twenty years time); and yes, there are (conveniently) 3 men and 3 women stranded on this island - but the result is subtle and moving, a cumulative effect belied by the simple progress of the story.
On some ways it's a fantasy work - the plot device of stranding the characters on an island is (just about) plausible, but plausibility isn't really that important. Much like in Sartre's Huis Clos (where 3 characters are in a room in hell that they cannot leave) it isolates the characters from society and forces them to think about what they want from life. As a result of this, the characters engage in some confessional/philosophising monologues that some readers may think are unlikely - but I was taken up in the freewheeling speculative nature of the story and had no problem with this (preferring it, in fact, to a reticent realism). Also, where other authors (such Ian Banks or Ian McEwan) might use a kidnapping scenario to dive into an abyss - I was impressed by the redemptive quality of the story.
I suppose the author (that I know of) that this has most in common with is Douglas Coupland - a similar tone and a desire to niggle away at what 20 and 30 somethings think they're doing with their lives.
All in all, I rattled through it, enjoyed reading it and was left satisfied.