[RC-Monster Mike]

Our kit is very well balanced when using a pair of 4s packs. The Castle motor and ESC, along with the radio box, steering servo, etc. add up to a decent amount of weight on the right side of the car(diff is also offset to the right).
The Madness kit locates the motor on the same side as the batteries, which doesn't seem like it would balance well at all.
The car itself is rather large and heavy so unless the weight balance is grossly off, most people won't notice it. Keeping the weight forward is helpful to get the car to turn - the size and mass of the beast makes it want to push otherwise.