dragula,
I have the perfection 4.2 and 4.2pro. I gotta say that these motors are really quick. I've raced these against a Phast motor and the 4.2s beat it. The 4.2Pro motor is quick without the boost function being used and with the booster being used its crazy fast. The only thing about the 4.2motors is that they don't have as much torque as the Phast motor. I'd recommend the 4.2 motors and especially for the price its a heck of a deal and not to mention you get 2 motors.
