RE: Do I need this stuff?
I don't believe any one here has eluded to the fact we should be sloppy with the set ups. I agree 100% that the plane must have the correct CG and control throws set for first flight success. The point is one does not need some gadget to do that. Measure, mark the CG and check it by lifting the model (sometimes that takes two people). Get out your measuring tape or ruler and check the control throws. Make sure they are right and you will be successful. It is that simple. There is no need to complicate basic, good techniques.