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

Q: I love my Zen Xtra 40GB - well at least I loved my Xtra. The player is great, except for one major detail - the shoddy quality of the headphone jack. IT WILL FAIL! If you get lucky it will still be under warranty. If you aren't expect to pay at least $40 for the clowns at Creative to fix it. If you think I am just flaming them, check out their forums.

A: Negative
****
Q: Can not beat this item for the price, hands down!Excellent product with all the features you could want, period.

A: Positive
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Q: I first read the Martian Chronicles as a teenager. They are in fact the only sci-fi I've ever read. What I want to know is why George Lucas or Steven Spielberg havn't made movies of them? With their abilities in the sci-fi world they could do a great job with them.

A:
Positive
****