Currently PC is running a $25 MIR of $150 purchases. Does it make sense to get PC 97366 $125 (150-25) over PC 7424? 97366 also comes with a carrying case, and has a 6" valcro backing plate by default. But it is the standard one, not contour what comes with 7424 kit. Does it really make a difference in using the CMA/lake country pads with this disc vs contour?