One of the most valuable facets of the Voltwatch is it's ability to warn you of bad wireing between the battery and the receiver. If you see those light dipping down into the unsafe region when you cycle the sticks, it is warning you that you have a high impedance path between the reciever and battery or something drawing momentary high currents; something the loaded voltmeter will not do. This is especially important for anyone using the new 2.4GHz systems--any brand--as a momentary drop in voltage can cause a dropout of the computer and recovery can take up to 2.5 seconds before the plane is responding properly again.