DS has had medic alert for years due to other stuff ( asthma etc..)
When you can't speak for yourself it is awesome.
24 hour access to online medical records that any hospital or doc can access that your create /update with your latest conditions /docs/ and meds.
This lets the emt know who to contact and what should be done once the doc gets the info.
It makes it faster for them to contact your doc.
Well worth it IMO .