These have been definitely worked in the real world. The only concern I have is that some of the
instructions were not correct or not clear; they either left out or forgot certain details. I can
only reason it by English not being his first language, it can be thought out easily. And I think he
may be left handed by some of the instructions. Overall, I'm pleased with the purchase. My first
time buying a Vernet book, would do it again.