FWIW I really think Medic Alert is great, and IF I was going to wear a medic necklace, I'd get medic alert. I like that they have so much more on file that they give ER personal when they call in for the info. When Justin had his pacemaker, he wore his 24/7 and when he broke his arm and the ambulance took him to the ER, the ER already had all his medical info as well as our phone numbers and his doctors, before Justin even got to ther ER, because the ambulance gave them Justin's medic alert number. When he got his pacer out and since he isn't on any meds, he doesn't wear his necklace. But he does have a wallet card from Medic alert (that you get with the necklace) that is right behind his liscene so I know they will find it. (He also has his medical records including his latest tests, on a USB flash key ring on his keys and both his necklace and wallet card and when anyone calls Medic Alert they are told about the flash drive.
I know from different threads both here and other heart groups, about over the years, it seems that people on coumadin i(f they think about it) usually get one, since that is an important thing ER personal should know about in case you end up there unconcious. But not as many people with tissue valves seem to think it is as important.