The Kuru Toga has an automated system that spins the lead every time the pen is lifted from the paper. This allows the lead to wear down evenly and in a conical shape.
The Advance includes an upgraded mechanism that rotates the lead twice as fast as the regular/standard Kuru Toga (once every 20 strokes vs. every 40 strokes.).
The Advance also features a protective sleeve for the pipe that protects the lead as you write.
The sleeve can be fully retracted when the pencil is not being used, protecting it from getting bent or poking a hole in your pocket or pencil case.