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

[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.
[A]: Positive


[Q]: It brought home an old classic - I can watch these guys over and over again.
[A]: Positive


[Q]: This is a great product overall. I was looking all over the place to buy these from stores but could not find it anywhere. My wife and I wanted to use these because the baby had used them while in the hospital and there is no washing or maintenance involved. However they are a bit pricey and the flow is fast relative to other nipples.
[A]:
Positive