I will always opt for a pat-down over the full-body scan because I have zero trust that the photos will not be saved and permanently associated with my name. At least with the pat down, once it's over, only the memories haunt you.
I had one aggressive female TSA woman search. The airport didn't have the nekkid scanners yet. She ran her hand up my legs and then ... how to put this... gave me a camel toe.
One of the videos linked in this thread had a TSA official saying they wouldn't be groping children under a certain age (9?). So what's to stop a terrorist from sneaking weapon/bomb-making material on a kid?
The TSA gives me the impression that they are very much about closing the barn door after the animals have escaped.
What does Tel Aviv do in their airport? It's supposed to be the safest in the world.