The first time I used the Nutri Chopper I used an onion. The onion had to be cut into small pieces so they would in the chopper. It took a little bit of pressure in order to get the blades through the onion, but that was expected. The pieces were uniform and the perfect size for what I was using them for. I was a little disappointed the second time I used it because one of the plastic pieces that help lock it broke off. I can still use it, but I am unable to lock it. All in all, it works ok, but it definitely not as durable as it should be.