Here is a wikipedia excerpt about the original Segway:

The Segway PT is a two-wheeled, self-balancing, battery-powered electric vehicle invented by Dean Kamen. It is produced bySegway Inc. of New Hampshire. The name Segway is derived from the word segue, meaning smooth transition. PT is an abbreviation for personal transporter.

Computers, sensors, and electric motors in the base of the Segway PT keep the device upright when powered on with balancing enabled. The rider commands the PT to go forward or backward by shifting their weight forward or backward on the platform. The PT uses gyroscopic sensors and accelerometer-based leveling sensors to detect the resulting changes in its pitch angle and, to maintain balance, it drives its wheels forward or backward as needed to return its pitch to upright. In the process, the rider establishes and then maintains a desired speed by modulating the extent and duration of their fore/aft weight shifts. To turn and steer, the rider shifts the handlebar to the left or right. The PT responds by adjusting the speeds of the wheels in opposite directions causing the PT to yaw and, if not traveling forward or backward, turn in place. At speed, the amount of shift of the handlebar corresponds to the amount of left or right lean required by the rider to balance themselves on the platform during a turn.

Segway PTs can reach a speed of 12.5 miles per hour (20.1 km/h).

What do you think is this a revolutionary invention or will it fail to catch on?  Feel free to comment this sure looks cool!