Last time I used them was about 4 years ago when my daughter and I went to N.Y. and thought we would be safer with Travellers Cheques. We had a terrible job trying to find a Bank that would change them, most banks told us they would not change them unless we had an account with them. We eventually did find a Bank. The Hotel we stayed in would change them, but for a charge and only $100 per day.
I think T.C's are totally outdated nowadays and would never think of using them again.