Hello Maverick, welcome to the forum
I never heard about that product. It's nice to have some alternatives. As i never tested or compared, i can only talking looking what i see on the website:
It's lot more expensive because includes a handheld computer. On the other hand, there's no need of laptop like in the Chronopic. I suppose this Just Jump Pad will have nice way to export data to computer.
Chronopic is open hardware, if you want you can build yourself from scratch, all the construction info is available. This allows to a researcher to use it ever, and Just Jump will be available only during the comercialization of the product.
Maybe some user has done any technical and more useful comparison. If this is the case, please answer here.