Only used one D&D and it was on a friends and AMD is more so a stock upgrade (and Walt showed the spec difference you can see) but to me they are better then the thin made GE motors, but NOTHING compared to the Plum Quick motors (The Bandit or the Executioner) and there is also the Admiral (Redhawk) line like the MOT-A2 (speed) and MOT-A4 (torque) and FSIP MOT-A3 (speed) so you may want expand your comparison - your choice.