On one side, we have typical prosthetic arms with five fingers, a complicated motor system and human resemblance. On the other side, we have this prosthetic tentacle with a one curl grip, simple motor and creeptastic design. Which is better?
The fact that I'd be terrified if I saw the Army's prototype Robotic Tentacle Manipulator skittering toward me is just a side effect of its design. The real reason for its snake-like limbs is adaptability.