For some reason the digital camera didn't really pick up the sound of the outrunner very well. At higher RPMs it sounds like a futuristic ray gun or something (it doesn't sound like that in person).
Only problem with the E-Maxx output shaft is that it's 6mm at the ends (like the Revo is), but the MT2 uses 5mm outputs. Also, I think the E-Maxx output shaft would be too long to fit on the chassis. Good idea though!
Sometime I might try that dehardening and rehardening method (with the steel shaft, of course
). But for now the holes are deep enough that there are set screws sitting in them, and it's a very solid fit.