So for a while I was thinking of creating a big ass tilt rotor tricopter with a X8 as a base frame. All good, but which ESC to use? After deciding that I don't really like anything on HobbyKing, I started working on my own. It had to have good quality components, rated for automotive applications (don't want my ESC to fail when flying...), FOC control, CAN/RS232/PWM interface and rotor position sensor input.
So after a couple of months, it is spinning. With a "bit" better micro than an 8 bit Atmel and a 12$ sensor chip we can get instant responses from motor to requests from the control - be it for faster/slower speed, startup from standstill or completely reversing rotational direction. And because it is field oriented control, when motor is decelerated it sends power back to the battery.