The Voltwatch IMHO is far superior to a loaded voltmeter in so far as keeping tabs on your flight readiness situation. It warns you if you are having wiring or switch problems as well as if the batteries are getting low. If you always check it at the end of each flight before turning off the switch, wiggle the sticks and make sure the LED's at the low end (the red one) don't flicker, you are usually in good shape. It is important that you have the Voltwatch attached to the receiver bus, not on the end of Y with another servo on the Y. If you must use a Y (no spare channel) I think it is best to have it Y'd with the throttle servo.