The biggest effect I see is being in the AMU gets you gooder. Wish I got into shooting earlier and could have done that. The finishing school for how to act like a good person would have been something useful. That and the bajillion rounds of ammo, good coaching, and the free matches and travel. Oh, and the networking!
That's pretty much the only shooting school I wish I could have gone to.
When it comes to the international/Olympic shooting sports, the AMU is THE ticket for Americans who want to win.