One thing to look out for is that there are two types of Chip+PIN. The first is online PIN, which is what all US banks issue if at all. The second is offline PIN, which is what most European banks issue. The difference as the name suggests is that online PIN cards require the terminal to be online to verify the PIN. While not an issue at hotels and stores, it does exclude a lot of small automated systems. Train, subway, gas pumps in Europe will most likely not work.