Yes, I do. I didn't for awhile, but had a couple of, er, incidents in public that were close calls. I realized that I could easily be mistaken for drunk and arrested, or pass out with no one knowing what to do.
I maintain an account through MedicAlert.org but I get my bracelets through Lauren's Hope. I have my Lauren's Hope bracelets engraved with my MedicAlert account information. So my bracelet says, "Type 1 Diabetes, Insulin Pump, 1-800-000-0000 (USA), XXXXXXX" (the XXXXX is my unique MedicAlert ID number).
I put "insulin pump" on there because if something were to happen and I were to be separated from my pump (like in an accident), I would want someone to know that I don't have any basal insulin in my system.
With my MedicAlert account, I can store a bunch of other information, such as multiple emergency contacts, other medical conditions, doctor's name, etc. I really like that because there's much more that they would need to know about me than what I could fit on the back of my bracelet.
I love the selection over at Lauren's Hope. I just ordered a new bracelet (one of the wraps) and it's great. Really looks nice, but you can still see that it's a medical ID.