The DC system is a different style of magnetic control. This is actually an electro magnet that can pulse on and off 1000 times per second. This is controlled by the microproccesser in the DC board. It uses an optical sensor to determine spool speed and will then select the braking curve depending on the posistion of the switch.
When I stated that the VBS is better than a magentic system I was refering to the standard magnetic braking system not the DC. The DC is in a class of its own