Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

[EX Q]: An extremely helpful gem on a complex subject of second century religious authority and textual use. For anyone serious about this period and the interelation of cultures, this book is essential. Is it complex and detailed? Of course, it must be to argue the point. Should you buy it? Yes, unless you want to keep running back to the library. I write this only after thoroughly disagreeing with the review above.
[EX A]: Positive

[EX Q]: What a junk. Every time NOMAD thinks the file is corrupt the OS freezes. The only way to recover is to plug the power cord and go into recovery mode. So if you happen to be out of the house and you have a frozen OS you can't use NOMAD until you get home. After OS froze twice on me in the subway I returned the jukebox.
[EX A]: Negative

[EX Q]: The Childhood of a Legendary KingThe tale of King Arthur's youth is an enthralling one. The Sword in the Stone explains King Arthur's youth throughout the book. His name is Wart in the book> From the adventures he takes with the other legends and queens to the learning experiences he has as animals, you won't want to put it down.What makes this book unique is Warts learning experience. He changes into four animals and he turns invisible by Merlin, Warts tutor. The adventures he goes on are amazing. He goes to a giants castle and goes to Morgan le Fay's castle to rescue Friar Tuck. Coming out they had to fight big bird-lion things. The book had no real conflicts.I don't really like reading, but this book is interesting. If you like fantasies then you would like this book. The reason is that he changes into different animals, turns invisible, and fights monsters. It is for readers 13+.
[EX A]:
Negative