Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: not a good oven

I purchased this for my mother. The first oven cord was hot when plugged in, the fan did not go on, and there was an electrical smell that came from it. We returned it, and the same thing happen with the second oven. Finally, we called Oster, they sent out a new oven, model 6058 and she is very happy with it.