Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Economical Radiator

I got this item one month ago, and used it to warm my bedroom (10X12ft). With the 600 watts set, it can help the room maintain a comfortable temperature. It performs better than my another heater, which consumes 850watts to keeps even lower temperature.Cons: The wheels are not very good for moving on carpet. And it's not easy to carry it when it's hot.