Not a chance in the world that this would work. The type of people who would use a rocket to spread their pamphlets are too dumb to get a rocket to fire, and would soon realize that the rocket body would make a great bong, maaaan...
Did you look at the link photo of their launcher? Its on the front of a bicycle. It did not say, but I'd bet that the launch controls are on the handlebars,plus how easy do you think it would be pedaling that thing down the road, much the interest a cop or two might take in what the hell you're up to.