DEKA Prosthetic arm is the best

This arm looks like it could really work. Brain control, with only one day of "training". This arm is the best I've seen.

"The DEKA Arm
Affectionately dubbed “Luke” (after Luke Skywalker), the robotic arm is a DARPA funded project intended to restore functionality for individuals with upper extremity amputations. The project is still in development, please check back for updates."