This video is not meant to be bias in any way. These are the most comparable size coils I own for each machine. I have to keep myself busy during the winter months, so I thought I would make a video of how each of these machines reacts in a simulated nail bed. I realize mineralization plays further into the equation. This video is simply to show how each machine might act in a nail infested area with the given coil shown. Take from it what you will. Hope you enjoy!http://youtu.be/Y1UbqdIF-a4