IMHO the Voltwatch is much superior to a loaded voltmeter or expanded scale voltmeter for the following reasons. If you see the lights dance when you wiggle the sticks it is telling you that you have a potential problem in your plane as you are getting voltage drops at the receiver (you do have the voltwatch plugged into one of the receiver channels, right?) due to either to small a gage wire between the battery and receiver, a high impedance switch, a servo drawing excess current when excited or some other problem causing this voltage drop between the battery and reciever. It is almost as good as monitoring the voltage with an oscilloscope. When everything is properly installed and you check it at the end of each flight before turning off the transmitter and receiver, you can be quite assured that another flight is safe to do.