I use the NWS fantastico cutters everyday. I own a business manufacturing luggage, and we use these cutters to remove the zipper teeth off of heavy #10 solid brass zippers. Every zipper we make has about 30 of these solid brass teeth removed, and they're not pulled off, they're cut. We use the Irwin rebranded ones. The oldest pair has literally cut thousands of zipper teeth, and still works effortlessly with one hand.
I started using them after reading a post on this forum from someone who also uses them for his business in a repetitive setting. I don't remember who it was or what he was cutting. He said he bought basically every cutter on the market and tested them, and the NWS fantastico was the clear winner. I'm glad I read that and bought them.
I recently picked up a pair of the knipex 8 inch cutters just to compare. They're not even in the same league as the NWS fantastico. It took actual effort to cut the zipper teeth. Enough effort that I found myself using two hands, and after one zipper my hands were sore. The NWS cuts effortlessly with one hand. I threw the knipex into my personal tool box. The knipex look to be exceptional quality, but they just require more effort. A LOT more effort.
If the NWS cutters had a spring on the handle they would be perfect. I might try to add one somehow.
Maybe the knipex mini bolt cutters are as good as the NWS fantastico, but I can't imagine them being better. But the regular knipex are not even close. I know its apples and oranges since the NWS has extra leverage due to the design. I know Knipex makes a cutter based on a similar concept. Maybe those are as good, but I've seen some tests done and the NWS always comes out on top.
Maybe someone who has used the NWS fantastico as well as the knipex mini bolt cutters can weight in. I just know from my personal experience that the NWS require such little effort to cut that its kind of baffling. We also cut a lot of #9 solid copper rivets, and it cuts those one handed with almost no effort. I tried the new Knipex just out of curiosity. It took two hands and some real effort. I think quality wise, the knipex are probably just as good. But the design of the NWS fantastico is just perfect.