As regards SESMA, regular PAX have never heard of it and have no idea of such equipment, other than 'the black box'. If you told them about SESMA, they would presume that you were using a technical term for the BB and I would take a bet on that. So, in my view, they NEVER consider saftey when buying a ticket from a Euro carrier.
As I have said before, Ryan were on my black list long before I joined this fabulous crew at PPRUNE. I only needed one round trip to convince me that they were very poor. The least of it was, the worst cabin service attitude EVER in 35 years and that includes Continental in the late 80s, before they got revamped!
The point about not blowing your own trumpet on safety is certainly true but I am sure the day will come when someone breaks that taboo. Interestingly, QANTAS do very nicely about their saftey record without advertising it. It was started by the comment in the movie "Rain Man".