Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useless

I tried this slicer and ended up throwing it away. It was so dull it wouldn't slice anything I tried--carrot, celery, cabbage, onion. Also, was dismayed to find that its use required three hands. The product information didn't include the fact that it is necessary to keep your thumb on a tab on the end of the platform in order to keep the blade stabilized. A totally useless product.