The mega is also an inrunner, but it's a 6 pole inrunner, not a 2 pole inrunner like the Hacker. Pretty sure it's a bigger motor than the 400DF, don't know how the torque is (noone ever posts those details), but it can handle a lot more current than the 400 DF, and it's pretty efficient. Weighs .42 ounces less, but can handle 16 amps continuous without a sweat (and it's really underrated). Same goes for my 16/15/3, it says max amps of 30, but it can handle 45 really well... I think it'd be worth a try. I just need to figure out how to keep the ESC cool, probably need to get a heatsink + water flow. Does this model have a water cooling ability?