I recently got this book from the library, as a guaranteed light and enjoyable read. I have read most of Sophie Kinsella's books, including several of the "Shopaholic" series. I think my favorite of her books so far are this one, and "The Undomestic Goddess" that I read earlier this year.
For whatever reason, these characters are more enjoyable to me than the ones in the Shopaholic series. Very similar, but a bit more realistic and interesting, as well as enjoyable. It's still a very light and entertaining, so don't expect anything earth-shattering. :)