Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works as well as they claim, but have plenty of ice!

Designed by Cooper Union engineering students who proved it was the most efficient way to chill beverages, the Cooper Cooler never fails to fascinate those guests who turn up at your barbecue with warm beer, wine, or soda. Happily, it also never fails to chill your potables to the core. Be warned, however, that you will consume a lot of ice in the process. (Since this device does not actually perform any refrigeration, you provide a mixture of water and ice which it cascades over the spinning container. The ice melts completely after only a few chilled cans, or one bottle of wine.)Another caveat, which may not have mattered to those in the engineering lab, is that this thing is hell on paper labels, what with the constant water, and the traction from the rubber wheels. You may then choose not to spin the bottle, but it will take approximately twice as long to chill your beverage.Such is life.