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

Example Input: Worked like a charm all over England. I haven't tried the other adaptors, but I found my MacBook to work just like it does here in the US, and there was no difficulty plugging into the outlets.
Example Output: Positive

Example Input: This portable heater is good for use in your office, den or sleeping area..It is quiet and efficient,and is good for spot heating...please keep away from drapes or rugs,and small children,who might mistake this heater for a toy...Otherwise this is a good deal...Mine came with a remote to adjust setttings more easily...4 star rated...
Example Output: Positive

Example Input: The first one I bought was defective. The DVD didn't work at all. I purchased it from Electronics Express and when I contacted them they were wonderful. They gave me an RMA number right away, Fedex picked it up the next day and a new one arrived 1 week later. This one is just fine. I really love the clarity of the picture. My only complaint is that in DVD mode, the sound isn't loud enough. I have it in my RV and with the A/C running, I can barely hear it. I solved the problem by running an audio out jack from the TV to the input on the RV stereo speaker system. It's very lightweight and easy to move around and store. A bonus for the RV. The remote isn't great, but it works just fine and the video/audio jacks and antenna input are easy to get to as is the DVD player. All in all, it's a great deal for the price.
Example Output:
Positive