Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It's not quick or safe

I have found this product extremely difficult to use. When I attempted to chop half an onion, no matter how hard I leaned on it, it just didn't work. I have to cut the onion into slices no more than 1/2 inch high, and I still have to lean of the top with all my weight to get it to work. Then I tried firm tomatoes and celery - it crushed them! And forget about potatoes and carrots.As for cleaning, the enclosed comb-like device makes it easy to clean the gripping surface in the lid, but cleaning the metal cutting grid is difficult and downright dangerous. I would not recommend this product to anyone.