Instruct: Classify a given review into positive or negative sentiment.
Query: Great Electric Kettle

I bought this kettle to save electricity because we were always boiling half a kettle of water in a conventional kettle just for one or two cups of coffee. With this kettle, we fill water to the level required for the number of cups we want and start it. No extra water boiled. Takes about 90 secs for one cup of water. Great!