I know we have one or two TTOL airline experts and wonder where one can find actual stats on the AA MIA-EIS-MIA route.

I'm in Ratsman's camp having had great experience (at least a dozen trips down and back) on that route since AA started it a couple years ago. The STT/Ferry route is fine if one has some timing flexibility. And its usually quite a bit less expensive. I always have trouble getting my flights reasonably aligned with the ferry schedule.