I've slipped once with my cutter so far, fortunately not a hospital trip. Burned myself twice with the iron that day as well so decided it was time to put down the tools.
I was teaching my son to use a rotary two weeks ago. It was different in style from the two I have at home which have guards over the blade. As I watched he positioned his finger along the top of the blade - fortunately I was watching so that he didn't follow up by slicing his finger open. We won't be buying that style cutter for household use any time soon - would have been very easy to end both the hockey and lacrosse seasons for him in one swipe.
These are not tools for the faint of heart or for the sleep deprived.
Cheers, K