My stock scx10 shut down after a few minutes with out a bec, after bec install I haven't had any problem... The bec is good cheap insurance for your esc!
Does the LVC work with 3s? I dont ever run anything to LVC but its nice to have added protection.
Just plugged in a 3s from one of my planes. I got the 3 beeps and goosed the throttle. I like it, just have to hook up my CC BEC.
Make sure you program bec for no more than max rated voltage to servo