An impact gun is better than a scaffold pole, it gives multiple hits per second so shocks the nut or bolt loose.
Saying that if you are trying to undo something that has some ''give'' an impact does not work well as the shocks are taken out by the ''give'' so the constant pressure of a scaffold pole works better.
One of the biggest benefits to me is the access. You can get an impact gun especially a battery powered version into a space a lot easier than a socket, extension and scaffold pole.
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