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This fast moving GBC is a perfect build for AFOL's and teen builders. It is a challenging build and opens a new dimension for LEGO. The curve is a unique aspect of this build and guides the ball up and out of the contraption. I believe it would be a perfect first GBC and it comes with a good array of gears.
The simple color scheme and simple gearing makes this a fun and exciting build. The curve is fun to build and is quite strong. It has a simple timing system that meets GBC standards. It runs off of two M motors and can easily be modified to run off of one motor.