IMHO I think the VW is much better than a loaded voltmeter. Not only is it always there without having to plug it in each flight, it give you much more better information. If you see those lights dancing more than two or three lights everytime you move the sticks, you know you have either a high impedance battery, a dirty or corroded switch, to small a gage wire between the battery and receiver, a sticky control setup on one or more servos or a combination of any two or more of those problems. Also, if you check it at the end of each flight and the battery is still in the green, you have been excercising the battery with the actual load you use.