I use it for low end skip stiction in 7.3s and the high end skip of 6.0s.
You can watch it work. Good buzz test but is a dead non oil discharging injector. It will get it working again. I have gotten texts and emails like," hey, I'm driving down the road and want to know where my truck is, this must be someone else's. This is awesome, I do not remember last time it ran this well.
Keep in mind if the wear/ damage is substantial, it's not going to bring them back.
Before buying injectors it's well worth trying for $60. It may take as much as 4K in miles to fully work. Always use it and you stay out of the woods.