I would have to give the set a B+. I'd like to give it an A, but I bought the case so I would no longer have free floating doll hair accessories in my purse, and the case didn't quite meet my expectations. While it is cute, the handle is prone to snapping (or tearing, actually, since it's just paper), and I had to reinforce it with scotch tape. Also, if you're not careful, opening the case the wrong way will cause all the rubber bands, etc., to spill out. My other problem is that the hair brush compartment only fits the standard AG-sized brush, and not the slightly bigger doll brushes bought at most online retailers.
I do love this set, though, despite all my griping. The tiara is definitely the best piece, and goes very well with Mia's silver skate dress. The hair clips are small, but I love the star shape. The blue elastics are really simple and go with most outfits, the perfect size, and I find myself using them a lot. They aren't very durable, though - one of mine snapped while I was taking it out of someone's hair. And the U-pins and clear elastics are so useful, I can't even describe my gratitude...I wish they sold these as replacement parts!
Oh, and only one word can describe that mini book: cute, cute, CUTE!