To be fair. most broken ez outs I see are when a person uses one too small. ie. the don't open the hole up sufficiently to use the largest ex out possible, with only a thin shell of the original stuck part in place.
on the flip side.. i also look at the original problem. if it was stuck bad enough that the original whole diameter fastener broke? why gripe if something with a smaller cross section breaks? kinda expected ain't it. ;) ?