I read this book, and the follow-up volume, "Debutante Divorcees" after I had read "The Devil Wears Prada" and "Everyone Worth Knowing" by Lauren Weisberger.
This is the lightest, frothiest example of the Chick Lit genre, and I enjoyed it and read it in about a day and a half. My only complaint: by the time I got to the end, I never, ever wanted to read or hear the phrase "going to Rio" ever again. Note to Ms. Sykes: a couple of times is cute; by the time you've said it 20 times, it just gets damned annoying.
For anyone who hasn't read it yet, I wouldn't be put off by customers' poor reviews. It obviously isn't meant to be great literature. Just devour it like the brain candy it is, and enjoy.