Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Favorite serise

I love this series. I own them in hardback and paperback. I re-read them all at least once a year. The virtual world Williams creates is vivid and immersing. Everyworld is unique. The charactes are individuals with limitations, choices and motivations. The plot was believable even in the fantastic setting, and with such great characters, the story was completely absorbing. I lost track of time, each time I read it. I know a series is good if I can get nearly as much out of it during a re-read. I stayed up nights reading these books. I would finish these lengthy books in two days. People would say "Wait, weren't you reading a different book yesterday?" My sister, who has never liked fantasy novels, disappeared with these books and also read then in a couple days.