Believe it or not, there is method to my madness:
I'm intending to ultimately go brushless but a MMM combo is too rich for me at present - It's the best part of £300 / $500 and I've just spent that on the E-Revo! Mrs R tz wouldn't be impressed!
So, I can get the combo in pieces. CastleLink first, then the ESC, then the motor and finally the batteries. The ESC can drive a brushed motor so I would be able to run the DeWalt and tune it using the CastleLink while I save up for the motor. I have no idea whether the MMM would show an improvement over the EVX2 driving the DeWalt but that's why I asked the question.
In the importal words of Johnny Cash " I got it one piece at a time......"