I've done this now for three years running. It's still too early for the youth that I taught the first time to have grown into full adulthood, so I still have to more or less take it on faith that what I've done is really working.
On the other hand, this post's title comes from a couple of OWL alums from before my time. When they'd heard that we were running it this year, they insisted that we needed to give the youth something besides just a copy of Changing Bodies, Changing Lives as a memento. So these two young adults designed and produced "I Survived O.W.L." keychains for all participants. Pretty cool, eh?