Nope I have not been there but I do have a trip booked on a liveaboard out of Hurghada next July. Being an Arizona resident I am very familiar with the Mexico border and the problem that crime and incidents cause. San Carlos Mexico is a very popular scuba destination due to location that was on the itinerary of EVERY dive shop here. It is about a 7-8 hour drive from Phoenix and was very reasonably priced. Until not too long ago all dive shops here cancelled trips there for years because of the border and cartel issues. Even though the chance of being involved in some Cartel violence was extremely low no one would even risk booking a trip or setting up a trip. There were swath's of armed federales there for protection as well.
See, I would have felt that driving between the border and San Carlos would involve MORE risk than flying in and out of Sharm (even if the worst fears prove true in the case of the recent event), but that's just my perception, and my perception could be completely screwed up. I just can't help but keep in mind that despite the event last week and scattered incidents in the past, planeloads of vacationers arrive and depart Sharm every day without incident.