The chopper works quite well, unfortunately I believe the bottom is designed poorly and ours developed a crack after only 5 uses. The bottom should be fully supported by the surface you’re using on because it will be a stress point, instead it is suspended half an inch or so and takes all the stress of the downward pressure used to make it work.
https://www.amazon.com/Ninja-200-Watt-16-Ounce-Chopping-NJ110GR/dp/B00HL3TBDQ