(copied from official support forum)
Vex uses standard hobby PWM servo protocol.
Here are some typical issues we come across with BEST Robotics;
You’ll need a male to male pwm cable or adapter for each plug, since Vex uses unshrouded male wires plugging into a female socket on the CPU,
but most RC hobby servos have a female wire tail.
Vex motor ports put out the full battery feedthrough, up to ~8volts,
while some servos are rated for 5v. BEST has burned out a number of 5v servos when they have a static load (stalled).
Vex supports BEST with a new male-male resistor cable.
and look for products Male to Male array, and Servo Power Adapter;
or make your own.
BEST uses the Cortex, not the PIC controller, but pinout and power are similar. If your ESC has its own battery feedthrough, you’ll probably be fine with the just the MM pin array rather than the resistor wire.