I got one of these from someone in DH's family for christmas. It really works just like it shows! I decided to try it today because I had to make a salad to take to dinner at my mother in laws and I didn't feel like standing there chopping all the stuff.
It took less than 5 minutes to chop an onion, 2 tomatoes, and 2 cucumbers. Most of that time was spent trying to get the peeling off the onion. The actual chopping part probably took less than 2 minutes. It really is as easy as just putting it on there and closing the lid.
Plus it was super easy to clean up. I am shocked. I always want these little gadgets but never buy them for myself because I think they never work as good or as easily as it shows. This one really and truly does!
https://www.chopwizard.com/