I bought the Sephora book at Barnes & Noble yesterday. I mainly bought it because I love collecting makeup books. The tips are very basic and frankly you get a lot better and more advanced advice here on Specktra.
It is basically like a big Sephora catalog with tons of their best brands promoted again and again.
The one thing I like is some of the quotes and stories by the inventors of different brands like BE, BeneFit, DuWop, Too Faced, and others. That was really the only interesting part.
I think that this book would be great for people starting out as it goes over basic skin care, what different brushes do, and basic makeup tips. But for most Specktra guys/gals you will feel like you could have written the book yourself.