What about a hybrid system like the Speed Passion GT ESC? That takes advantage of the sensored starts, but can still do the automatic timing. I never heard of a sensored motor having lower efficiency; if anything, I've noticed that they run cooler for the revs they have to spin (I know they don't put out THAT much power, but they're no slouches- especially once you get into the lower turns).

If someone could put out a sensored system that can deal out the amount of power your guys' system puts out, I think it'd be a hit (screw ROAR... I could care less if it's ROAR legal). I'm pretty happy with my Mamba Max and Medusa setup though.

Methinks I need a CC BEC so I can run 3s happily all day.