My partner has a MedicAlert bracelet for a few conditions, most important one being epilepsy. It's been useful to ambulance staff a number of times when she's had a sudden seizure when out.
Also bit of a thumbs up to MedicAlert too. Few months ago she ordered a new bracelet as her old one was years old and starting to look pretty worn. Just got the cheapest option. It arrived, and then a couple of days later she was having a CT scan for something unrelated and had a bad reaction to the contrast dye they injected. She had the worst seizure of her life and ended up in ICU at Wellington Hospital for 3 days (she's ok now). A week or so after she got out she had to go back to Wellington Hospital for a follow up neurology appointment following on from what happened. After she left she fell over in the street outside the Hospital (turned out they had increased her medication too much so she was a bit like a zombie) and the new bracelet broke in the fall. Pretty annoying having just bought it less than 2 weeks earlier. She called MedicAlert and told them what happened and they sent her a brand new one free. So thumbs up to them for that when it wasn't their fault at all, we expected we'd just have to buy another one.


