ORIGINAL: Lynx
Unless you're a servo technician it's a waste of money. Use your radio to test your servo's. The one nice thing it does that seems to make it worth it is give you an active display of the current usage. But you can do the same thing with a 12 dollar multi meter.
Please don't send bad information, it is not a waste of money, there is many use for it and I use the one from Multiplex all the time and I am not a servo technician.
Roger