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

[EX Q]: You aren't saving any being this adapter. I purchased this for a 12" G4 Powerbook. The power it supplies goes on and off constantly. This can't be good for the computer. It certainly doesn't charge it. Don't waste your money on this Macally adapter. Try to find an original Apple adapter if you can.
[EX A]: Negative

[EX Q]: On a number of occasions, it had been suggested that I read this book, and I must say I'm very glad I did. I got very involved, as the writing was so wonderfully descriptive. Having said this, I don't think it was arduous to read all that detail, which sometimes makes reading a book feel a bit of a chore. I would recommend it to anyone!
[EX A]: Positive

[EX Q]: Come on people! Even Jack Vance's zany Dying Earth novels (Cugel in particular) have more substance than this lackadaisical tour-de-force. Skip out on Burroughs, if you want quality sci-fi read the Demon Princes by Jack Vance...
[EX A]:
Negative