I just graduated from college and thought this would be a useful 'establishing myself' book. If you can get passed her annoying writing (she constantly calls you a bitch throughout the book), she offers good advice.
What I found most helpful is that she provides examples of cheap stores, products, entertainment, and services. She believes that the best place to buy jeans is at Banana Republic, underwear and bras at GapBody, t-shirts and workout clothes from Target and Wal-Mart, accessories from Forever 21, and etc. You should avoid clothes from JcPenny and Kohls due to cost and lack of stylish options. She also provides great ideas for cheap entertainment (book club with friends, volunteering). I appreciated her idea that we need to go back and start using the library again.
I've already started using some of her ideas. Recommended if you don't mind being calling a biatch the whole time.