Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The product is a joke ... don't buy it

This warmer is an absolute joke. Thank God I was able to return the thing and get my money back. It would be a great product if it had a thermostat that allowed you pop in the bottle, and it'll only warm it to the safe level and keeps it at that temparature. But it doesn't. Any jug with hot water will do the same. In the end we prefer to use the Microwave now ... it's quicker and thus more reliable as the bottle is warm in 30s.