I profess to know absolutely Zilch about electronics and electrics in my boats, Damien, but when speeking to the owner of Electronize some time ago about speed controllers with /without BEC, he put the scenario to me of the esc blowing it's fuse if weed got round the prop and stopped working, I would then have no power to the other should it not have BEC......as I am not one for mixer boards and such things, trying to keep things as simple as can be, I have always opted for both my ESC's having BEC conected so that I have power to at least one motor.
neil.