Instruct: Classify Amazon reviews into positive or negative sentiment
Query: So safe it is useless.

We have had this mandoline for over a year and have never been able to slice on it. After reading the reviews here we now know why. You HAVE to use the food holder to make the blade come up. So much for slicing tomatoes, onions, potatoes. These items do not fit in the holder. Even if you could get something sliced in it you only get 2 thicknesses.