Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Simply doesn't work very well

... for any but very small vegetables (cucumber, celery, small zucchini). Anything larger keeps slipping off the gripper. The knob in the middle of the reverse of the blade gets in the way of anything with a diameter greater than a cucumber, so forget slicing onions or tomoatoes. It seems almost completely unable to cut any vegetable with any density, so forget slicing potatoes or carrots. It collapses regularly, so be very careful because the blades are sharp enough to give a nasty cut. I threw mine away after trying to use it 5 or 6 times. Bad design, poorly executed. I'd give zero stars, but I'm not sure it would register.