The book was really different from the show, but not less amazing. Though I really missed some characters from the show (like Raven, Monty, Miller etc.), the ones from the book were great too. I especially loved Glass and her story. Gotta say, I liked Show!Wells better than the one in the book (he reminded me WAY to much of Finn in the book). Can't wait to read the two other parts. 
 ps.: Bellamy Blake has to be my most favorite fictional character EVER.