According to folks I've talked to at Loma Linda U. (which, although you may not be familiar with it, is a very prestigious Seventh Day Adventist school in Southern California, pioneers in pediatric transplant surgery, home of Dr. Leonard Bailey who did the "Baby Fae" baboon heart transplant), as well as UC Irvine, RCSI grads are NOT thought of in the same ways as Caribbean or Mexican grads (some of whom have been accepted in residencies by both schools, btw) but more like grads from Oxford, The Karolinska Inst., etc. ---definitely a big prestige edge, if not an actual competncy edge.