I loved Estes rockets as a boy. I in fact made a horizontally launching rocket tube device that I shot at my shed. I wore a helmet and didn't kill anybody but I know that if a bored kid in America's Heartland made one of those today they'd be on him or her like lightning.
I suppose its a sign of the times that Estes is now making hydrogen fuel rockets. I'm not quite sure if these really generate hydrogen, which might be dangerous. They seem to use some sort of flavor crystal for lift-off.